iScroll click事件触发两次的解决方案

﹏ヽ暗。殇╰゛Y 2022-07-14 02:55 240阅读 0赞

iScroll呢其实是截获了点击浏览器时的touchstart和touchend事件。在touchend的时候使用js去触发元素的onclick事件(\_end这个函数)。而在实际操作中，先执行了touchend，然后再执行了一次onclick的相关函数。这样就形成了头疼的一次点击两次触发！

**网上有很多代码说解决“iScroll click事件”点击一次触发两次，我也是按着各位大神的步骤写的，但是依旧不成功，也可能是操作不对，我附上我的执行操作的代码，我的已经成功。**

**解决方案1：点击事件使用Zepto的 tap ，进行解决。**  
  
  
**解决方案2：在iscroll搜索that.doubleTapTimer将其注释掉 或者 直接注释以下557-573行即可！**

/*! * iScroll v4.2.5 ~ Copyright (c) 2012 Matteo Spinelli, http://cubiq.org * Released under MIT license, http://cubiq.org/license */
    (function(window, doc){ 
    var m = Math,
        dummyStyle = doc.createElement('div').style,
        vendor = (function () { 
            var vendors = 't,webkitT,MozT,msT,OT'.split(','),
                t,
                i = 0,
                l = vendors.length;
    
            for ( ; i < l; i++ ) {
                t = vendors[i] + 'ransform';
                if ( t in dummyStyle ) {
                    return vendors[i].substr(0, vendors[i].length - 1);
                }
            }
    
            return false;
        })(),
        cssVendor = vendor ? '-' + vendor.toLowerCase() + '-' : '',
    
        // Style properties
        transform = prefixStyle('transform'),
        transitionProperty = prefixStyle('transitionProperty'),
        transitionDuration = prefixStyle('transitionDuration'),
        transformOrigin = prefixStyle('transformOrigin'),
        transitionTimingFunction = prefixStyle('transitionTimingFunction'),
        transitionDelay = prefixStyle('transitionDelay'),
    
        // Browser capabilities
        isAndroid = (/android/gi).test(navigator.appVersion),
        isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
        isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),
    
        has3d = prefixStyle('perspective') in dummyStyle,
        hasTouch = 'ontouchstart' in window && !isTouchPad,
        hasTransform = vendor !== false,
        hasTransitionEnd = prefixStyle('transition') in dummyStyle,
    
        RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
        START_EV = hasTouch ? 'touchstart' : 'mousedown',
        MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
        END_EV = hasTouch ? 'touchend' : 'mouseup',
        CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
        TRNEND_EV = (function () { 
            if ( vendor === false ) return false;
    
            var transitionEnd = {
                    ''          : 'transitionend',
                    'webkit'    : 'webkitTransitionEnd',
                    'Moz'       : 'transitionend',
                    'O'         : 'otransitionend',
                    'ms'        : 'MSTransitionEnd'
                };
    
            return transitionEnd[vendor];
        })(),
    
        nextFrame = (function() { 
            return window.requestAnimationFrame ||
                window.webkitRequestAnimationFrame ||
                window.mozRequestAnimationFrame ||
                window.oRequestAnimationFrame ||
                window.msRequestAnimationFrame ||
                function(callback) {  return setTimeout(callback, 1); };
        })(),
        cancelFrame = (function () { 
            return window.cancelRequestAnimationFrame ||
                window.webkitCancelAnimationFrame ||
                window.webkitCancelRequestAnimationFrame ||
                window.mozCancelRequestAnimationFrame ||
                window.oCancelRequestAnimationFrame ||
                window.msCancelRequestAnimationFrame ||
                clearTimeout;
        })(),
    
        // Helpers
        translateZ = has3d ? ' translateZ(0)' : '',
    
        // Constructor
        iScroll = function (el, options) { 
            var that = this,
                i;
    
            that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
            that.wrapper.style.overflow = 'hidden';
            that.scroller = that.wrapper.children[0];
    
            // Default options
            that.options = {
                hScroll: true,
                vScroll: true,
                x: 0,
                y: 0,
                bounce: true,
                bounceLock: false,
                momentum: true,
                lockDirection: true,
                useTransform: true,
                useTransition: false,
                topOffset: 0,
                checkDOMChanges: false,     // Experimental
                handleClick: true,
    
                // Scrollbar
                hScrollbar: true,
                vScrollbar: true,
                fixedScrollbar: isAndroid,
                hideScrollbar: isIDevice,
                fadeScrollbar: isIDevice && has3d,
                scrollbarClass: '',
    
                // Zoom
                zoom: false,
                zoomMin: 1,
                zoomMax: 4,
                doubleTapZoom: 2,
                wheelAction: 'scroll',
    
                // Snap
                snap: false,
                snapThreshold: 1,
    
                // Events
                onRefresh: null,
                onBeforeScrollStart: null,
                onScrollStart: null,
                onBeforeScrollMove: null,
                onScrollMove: null,
                onBeforeScrollEnd: null,
                onScrollEnd: null,
                onTouchEnd: null,
                onDestroy: null,
                onZoomStart: null,
                onZoom: null,
                onZoomEnd: null
            };
    
            // User defined options
            for (i in options) that.options[i] = options[i];
    
            // Set starting position
            that.x = that.options.x;
            that.y = that.options.y;
    
            // Normalize options
            that.options.useTransform = hasTransform && that.options.useTransform;
            that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
            that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
            that.options.zoom = that.options.useTransform && that.options.zoom;
            that.options.useTransition = hasTransitionEnd && that.options.useTransition;
    
            // Helpers FIX ANDROID BUG!
            // translate3d and scale doesn't work together!
            // Ignoring 3d ONLY WHEN YOU SET that.options.zoom
            if ( that.options.zoom && isAndroid ){
                translateZ = '';
            }
    
            // Set some default styles
            that.scroller.style[transitionProperty] = that.options.useTransform ? cssVendor + 'transform' : 'top left';
            that.scroller.style[transitionDuration] = '0';
            that.scroller.style[transformOrigin] = '0 0';
            if (that.options.useTransition) that.scroller.style[transitionTimingFunction] = 'cubic-bezier(0.33,0.66,0.66,1)';
    
            if (that.options.useTransform) that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px)' + translateZ;
            else that.scroller.style.cssText += ';position:absolute;top:' + that.y + 'px;left:' + that.x + 'px';
    
            if (that.options.useTransition) that.options.fixedScrollbar = true;
    
            that.refresh();
    
            that._bind(RESIZE_EV, window);
            that._bind(START_EV);
            if (!hasTouch) {
                if (that.options.wheelAction != 'none') {
                    that._bind('DOMMouseScroll');
                    that._bind('mousewheel');
                }
            }
    
            if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () { 
                that._checkDOMChanges();
            }, 500);
        };
    
    // Prototype
    iScroll.prototype = {
        enabled: true,
        x: 0,
        y: 0,
        steps: [],
        scale: 1,
        currPageX: 0, currPageY: 0,
        pagesX: [], pagesY: [],
        aniTime: null,
        wheelZoomCount: 0,
    
        handleEvent: function (e) { 
            var that = this;
            switch(e.type) {
                case START_EV:
                    if (!hasTouch && e.button !== 0) return;
                    that._start(e);
                    break;
                case MOVE_EV: that._move(e); break;
                case END_EV:
                case CANCEL_EV: that._end(e); break;
                case RESIZE_EV: that._resize(); break;
                case 'DOMMouseScroll': case 'mousewheel': that._wheel(e); break;
                case TRNEND_EV: that._transitionEnd(e); break;
            }
        },
    
        _checkDOMChanges: function () { 
            if (this.moved || this.zoomed || this.animating ||
                (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;
    
            this.refresh();
        },
    
        _scrollbar: function (dir) { 
            var that = this,
                bar;
    
            if (!that[dir + 'Scrollbar']) {
                if (that[dir + 'ScrollbarWrapper']) {
                    if (hasTransform) that[dir + 'ScrollbarIndicator'].style[transform] = '';
                    that[dir + 'ScrollbarWrapper'].parentNode.removeChild(that[dir + 'ScrollbarWrapper']);
                    that[dir + 'ScrollbarWrapper'] = null;
                    that[dir + 'ScrollbarIndicator'] = null;
                }
    
                return;
            }
    
            if (!that[dir + 'ScrollbarWrapper']) {
                /* // Create the scrollbar wrapper bar = doc.createElement('div'); if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase(); else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px'); bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:opacity;' + cssVendor + 'transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1'); that.wrapper.appendChild(bar); that[dir + 'ScrollbarWrapper'] = bar; // Create the scrollbar indicator bar = doc.createElement('div'); if (!that.options.scrollbarClass) { bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);' + cssVendor + 'background-clip:padding-box;' + cssVendor + 'box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';' + cssVendor + 'border-radius:3px;border-radius:3px'; } bar.style.cssText += ';pointer-events:none;' + cssVendor + 'transition-property:' + cssVendor + 'transform;' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);' + cssVendor + 'transition-duration:0;' + cssVendor + 'transform: translate(0,0)' + translateZ; if (that.options.useTransition) bar.style.cssText += ';' + cssVendor + 'transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)'; that[dir + 'ScrollbarWrapper'].appendChild(bar); that[dir + 'ScrollbarIndicator'] = bar; */
    
                /*去除滚动条2016-08-26 yubai8*/
                bar = doc.createElement('div');
                that[dir + 'ScrollbarWrapper'] = bar;
                that[dir + 'ScrollbarIndicator'] = bar;
    
            }
    
            if (dir == 'h') {
                that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
                that.hScrollbarIndicatorSize = m.max(m.round(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
                that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
                that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
                that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
            } else {
                that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
                that.vScrollbarIndicatorSize = m.max(m.round(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
                that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
                that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
                that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
            }
    
            // Reset position
            that._scrollbarPos(dir, true);
        },
    
        _resize: function () { 
            var that = this;
            setTimeout(function () {  that.refresh(); }, isAndroid ? 200 : 0);
        },
    
        _pos: function (x, y) { 
            if (this.zoomed) return;
    
            x = this.hScroll ? x : 0;
            y = this.vScroll ? y : 0;
    
            if (this.options.useTransform) {
                this.scroller.style[transform] = 'translate(' + x + 'px,' + y + 'px) scale(' + this.scale + ')' + translateZ;
            } else {
                x = m.round(x);
                y = m.round(y);
                this.scroller.style.left = x + 'px';
                this.scroller.style.top = y + 'px';
            }
    
            this.x = x;
            this.y = y;
    
            this._scrollbarPos('h');
            this._scrollbarPos('v');
        },
    
        _scrollbarPos: function (dir, hidden) { 
            var that = this,
                pos = dir == 'h' ? that.x : that.y,
                size;
    
            if (!that[dir + 'Scrollbar']) return;
    
            pos = that[dir + 'ScrollbarProp'] * pos;
    
            if (pos < 0) {
                if (!that.options.fixedScrollbar) {
                    size = that[dir + 'ScrollbarIndicatorSize'] + m.round(pos * 3);
                    if (size < 8) size = 8;
                    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                }
                pos = 0;
            } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
                if (!that.options.fixedScrollbar) {
                    size = that[dir + 'ScrollbarIndicatorSize'] - m.round((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
                    if (size < 8) size = 8;
                    that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                    pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
                } else {
                    pos = that[dir + 'ScrollbarMaxScroll'];
                }
            }
    
            that[dir + 'ScrollbarWrapper'].style[transitionDelay] = '0';
            that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
            that[dir + 'ScrollbarIndicator'].style[transform] = 'translate(' + (dir == 'h' ? pos + 'px,0)' : '0,' + pos + 'px)') + translateZ;
        },
    
        _start: function (e) { 
            var that = this,
                point = hasTouch ? e.touches[0] : e,
                matrix, x, y,
                c1, c2;
    
            if (!that.enabled) return;
    
            if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);
    
            if (that.options.useTransition || that.options.zoom) that._transitionTime(0);
    
            that.moved = false;
            that.animating = false;
            that.zoomed = false;
            that.distX = 0;
            that.distY = 0;
            that.absDistX = 0;
            that.absDistY = 0;
            that.dirX = 0;
            that.dirY = 0;
    
            // Gesture start
            if (that.options.zoom && hasTouch && e.touches.length > 1) {
                c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX);
                c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY);
                that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);
    
                that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
                that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;
    
                if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
            }
    
            if (that.options.momentum) {
                if (that.options.useTransform) {
                    // Very lame general purpose alternative to CSSMatrix
                    matrix = getComputedStyle(that.scroller, null)[transform].replace(/[^0-9\-.,]/g, '').split(',');
                    x = +(matrix[12] || matrix[4]);
                    y = +(matrix[13] || matrix[5]);
                } else {
                    x = +getComputedStyle(that.scroller, null).left.replace(/[^0-9-]/g, '');
                    y = +getComputedStyle(that.scroller, null).top.replace(/[^0-9-]/g, '');
                }
    
                if (x != that.x || y != that.y) {
                    if (that.options.useTransition) that._unbind(TRNEND_EV);
                    else cancelFrame(that.aniTime);
                    that.steps = [];
                    that._pos(x, y);
                    if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);
                }
            }
    
            that.absStartX = that.x;    // Needed by snap threshold
            that.absStartY = that.y;
    
            that.startX = that.x;
            that.startY = that.y;
            that.pointX = point.pageX;
            that.pointY = point.pageY;
    
            that.startTime = e.timeStamp || Date.now();
    
            if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);
    
            that._bind(MOVE_EV, window);
            that._bind(END_EV, window);
            that._bind(CANCEL_EV, window);
        },
    
        _move: function (e) { 
            var that = this,
                point = hasTouch ? e.touches[0] : e,
                deltaX = point.pageX - that.pointX,
                deltaY = point.pageY - that.pointY,
                newX = that.x + deltaX,
                newY = that.y + deltaY,
                c1, c2, scale,
                timestamp = e.timeStamp || Date.now();
    
            if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);
    
            // Zoom
            if (that.options.zoom && hasTouch && e.touches.length > 1) {
                c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
                c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
                that.touchesDist = m.sqrt(c1*c1+c2*c2);
    
                that.zoomed = true;
    
                scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;
    
                if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);
                else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);
    
                that.lastScale = scale / this.scale;
    
                newX = this.originX - this.originX * that.lastScale + this.x;
                newY = this.originY - this.originY * that.lastScale + this.y;
    
                this.scroller.style[transform] = 'translate(' + newX + 'px,' + newY + 'px) scale(' + scale + ')' + translateZ;
    
                if (that.options.onZoom) that.options.onZoom.call(that, e);
                return;
            }
    
            that.pointX = point.pageX;
            that.pointY = point.pageY;
    
            // Slow down if outside of the boundaries
            if (newX > 0 || newX < that.maxScrollX) {
                newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
            }
            if (newY > that.minScrollY || newY < that.maxScrollY) {
                newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
            }
    
            that.distX += deltaX;
            that.distY += deltaY;
            that.absDistX = m.abs(that.distX);
            that.absDistY = m.abs(that.distY);
    
            if (that.absDistX < 6 && that.absDistY < 6) {
                return;
            }
    
            // Lock direction
            if (that.options.lockDirection) {
                if (that.absDistX > that.absDistY + 5) {
                    newY = that.y;
                    deltaY = 0;
                } else if (that.absDistY > that.absDistX + 5) {
                    newX = that.x;
                    deltaX = 0;
                }
            }
    
            that.moved = true;
            that._pos(newX, newY);
            that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
            that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;
    
            if (timestamp - that.startTime > 300) {
                that.startTime = timestamp;
                that.startX = that.x;
                that.startY = that.y;
            }
    
            if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
        },
    
        _end: function (e) { 
            if (hasTouch && e.touches.length !== 0) return;
    
            var that = this,
                point = hasTouch ? e.changedTouches[0] : e,
                target, ev,
                momentumX = { dist:0, time:0 },
                momentumY = { dist:0, time:0 },
                duration = (e.timeStamp || Date.now()) - that.startTime,
                newPosX = that.x,
                newPosY = that.y,
                distX, distY,
                newDuration,
                snap,
                scale;
    
            that._unbind(MOVE_EV, window);
            that._unbind(END_EV, window);
            that._unbind(CANCEL_EV, window);
    
            if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);
    
            if (that.zoomed) {
                scale = that.scale * that.lastScale;
                scale = Math.max(that.options.zoomMin, scale);
                scale = Math.min(that.options.zoomMax, scale);
                that.lastScale = scale / that.scale;
                that.scale = scale;
    
                that.x = that.originX - that.originX * that.lastScale + that.x;
                that.y = that.originY - that.originY * that.lastScale + that.y;
    
                that.scroller.style[transitionDuration] = '200ms';
                that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + that.scale + ')' + translateZ;
    
                that.zoomed = false;
                that.refresh();
    
                if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                return;
            }
    
            if (!that.moved) {
                if (hasTouch) {
                    if (that.doubleTapTimer && that.options.zoom) {
                        // Double tapped
                        clearTimeout(that.doubleTapTimer);
                        that.doubleTapTimer = null;
                        if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                        that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
                        if (that.options.onZoomEnd) {
                            setTimeout(function() { 
                                that.options.onZoomEnd.call(that, e);
                            }, 200); // 200 is default zoom duration
                        }
                    } else if (this.options.handleClick) {
                        /*that.doubleTapTimer = setTimeout(function () { that.doubleTapTimer = null; // Find the last touched element target = point.target; while (target.nodeType != 1) target = target.parentNode; if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') { ev = doc.createEvent('MouseEvents'); ev.initMouseEvent('click', true, true, e.view, 1, point.screenX, point.screenY, point.clientX, point.clientY, e.ctrlKey, e.altKey, e.shiftKey, e.metaKey, 0, null); ev._fake = true; target.dispatchEvent(ev); } }, that.options.zoom ? 250 : 0);*/
                    }
                }
    
                that._resetPos(400);
    
                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }
    
            if (duration < 300 && that.options.momentum) {
                momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
                momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;
    
                newPosX = that.x + momentumX.dist;
                newPosY = that.y + momentumY.dist;
    
                if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };
                if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };
            }
    
            if (momentumX.dist || momentumY.dist) {
                newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);
    
                // Do we need to snap?
                if (that.options.snap) {
                    distX = newPosX - that.absStartX;
                    distY = newPosY - that.absStartY;
                    if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }
                    else {
                        snap = that._snap(newPosX, newPosY);
                        newPosX = snap.x;
                        newPosY = snap.y;
                        newDuration = m.max(snap.time, newDuration);
                    }
                }
    
                that.scrollTo(m.round(newPosX), m.round(newPosY), newDuration);
    
                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }
    
            // Do we need to snap?
            if (that.options.snap) {
                distX = newPosX - that.absStartX;
                distY = newPosY - that.absStartY;
                if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
                else {
                    snap = that._snap(that.x, that.y);
                    if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
                }
    
                if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
                return;
            }
    
            that._resetPos(200);
            if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
        },
    
        _resetPos: function (time) { 
            var that = this,
                resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
                resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
    
            if (resetX == that.x && resetY == that.y) {
                if (that.moved) {
                    that.moved = false;
                    if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);      // Execute custom code on scroll end
                }
    
                if (that.hScrollbar && that.options.hideScrollbar) {
                    if (vendor == 'webkit') that.hScrollbarWrapper.style[transitionDelay] = '300ms';
                    that.hScrollbarWrapper.style.opacity = '0';
                }
                if (that.vScrollbar && that.options.hideScrollbar) {
                    if (vendor == 'webkit') that.vScrollbarWrapper.style[transitionDelay] = '300ms';
                    that.vScrollbarWrapper.style.opacity = '0';
                }
    
                return;
            }
    
            that.scrollTo(resetX, resetY, time || 0);
        },
    
        _wheel: function (e) { 
            var that = this,
                wheelDeltaX, wheelDeltaY,
                deltaX, deltaY,
                deltaScale;
    
            if ('wheelDeltaX' in e) {
                wheelDeltaX = e.wheelDeltaX / 12;
                wheelDeltaY = e.wheelDeltaY / 12;
            } else if('wheelDelta' in e) {
                wheelDeltaX = wheelDeltaY = e.wheelDelta / 12;
            } else if ('detail' in e) {
                wheelDeltaX = wheelDeltaY = -e.detail * 3;
            } else {
                return;
            }
    
            if (that.options.wheelAction == 'zoom') {
                deltaScale = that.scale * Math.pow(2, 1/3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
                if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
                if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;
    
                if (deltaScale != that.scale) {
                    if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                    that.wheelZoomCount++;
    
                    that.zoom(e.pageX, e.pageY, deltaScale, 400);
    
                    setTimeout(function() { 
                        that.wheelZoomCount--;
                        if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                    }, 400);
                }
    
                return;
            }
    
            deltaX = that.x + wheelDeltaX;
            deltaY = that.y + wheelDeltaY;
    
            if (deltaX > 0) deltaX = 0;
            else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;
    
            if (deltaY > that.minScrollY) deltaY = that.minScrollY;
            else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;
    
            if (that.maxScrollY < 0) {
                that.scrollTo(deltaX, deltaY, 0);
            }
        },
    
        _transitionEnd: function (e) { 
            var that = this;
    
            if (e.target != that.scroller) return;
    
            that._unbind(TRNEND_EV);
    
            that._startAni();
        },
    
    
        /** * * Utilities * */
        _startAni: function () { 
            var that = this,
                startX = that.x, startY = that.y,
                startTime = Date.now(),
                step, easeOut,
                animate;
    
            if (that.animating) return;
    
            if (!that.steps.length) {
                that._resetPos(400);
                return;
            }
    
            step = that.steps.shift();
    
            if (step.x == startX && step.y == startY) step.time = 0;
    
            that.animating = true;
            that.moved = true;
    
            if (that.options.useTransition) {
                that._transitionTime(step.time);
                that._pos(step.x, step.y);
                that.animating = false;
                if (step.time) that._bind(TRNEND_EV);
                else that._resetPos(0);
                return;
            }
    
            animate = function () { 
                var now = Date.now(),
                    newX, newY;
    
                if (now >= startTime + step.time) {
                    that._pos(step.x, step.y);
                    that.animating = false;
                    if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);            // Execute custom code on animation end
                    that._startAni();
                    return;
                }
    
                now = (now - startTime) / step.time - 1;
                easeOut = m.sqrt(1 - now * now);
                newX = (step.x - startX) * easeOut + startX;
                newY = (step.y - startY) * easeOut + startY;
                that._pos(newX, newY);
                if (that.animating) that.aniTime = nextFrame(animate);
            };
    
            animate();
        },
    
        _transitionTime: function (time) { 
            time += 'ms';
            this.scroller.style[transitionDuration] = time;
            if (this.hScrollbar) this.hScrollbarIndicator.style[transitionDuration] = time;
            if (this.vScrollbar) this.vScrollbarIndicator.style[transitionDuration] = time;
        },
    
        _momentum: function (dist, time, maxDistUpper, maxDistLower, size) { 
            var deceleration = 0.0006,
                speed = m.abs(dist) / time,
                newDist = (speed * speed) / (2 * deceleration),
                newTime = 0, outsideDist = 0;
    
            // Proportinally reduce speed if we are outside of the boundaries
            if (dist > 0 && newDist > maxDistUpper) {
                outsideDist = size / (6 / (newDist / speed * deceleration));
                maxDistUpper = maxDistUpper + outsideDist;
                speed = speed * maxDistUpper / newDist;
                newDist = maxDistUpper;
            } else if (dist < 0 && newDist > maxDistLower) {
                outsideDist = size / (6 / (newDist / speed * deceleration));
                maxDistLower = maxDistLower + outsideDist;
                speed = speed * maxDistLower / newDist;
                newDist = maxDistLower;
            }
    
            newDist = newDist * (dist < 0 ? -1 : 1);
            newTime = speed / deceleration;
    
            return { dist: newDist, time: m.round(newTime) };
        },
    
        _offset: function (el) { 
            var left = -el.offsetLeft,
                top = -el.offsetTop;
    
            while (el = el.offsetParent) {
                left -= el.offsetLeft;
                top -= el.offsetTop;
            }
    
            if (el != this.wrapper) {
                left *= this.scale;
                top *= this.scale;
            }
    
            return { left: left, top: top };
        },
    
        _snap: function (x, y) { 
            var that = this,
                i, l,
                page, time,
                sizeX, sizeY;
    
            // Check page X
            page = that.pagesX.length - 1;
            for (i=0, l=that.pagesX.length; i<l; i++) {
                if (x >= that.pagesX[i]) {
                    page = i;
                    break;
                }
            }
            if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
            x = that.pagesX[page];
            sizeX = m.abs(x - that.pagesX[that.currPageX]);
            sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
            that.currPageX = page;
    
            // Check page Y
            page = that.pagesY.length-1;
            for (i=0; i<page; i++) {
                if (y >= that.pagesY[i]) {
                    page = i;
                    break;
                }
            }
            if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
            y = that.pagesY[page];
            sizeY = m.abs(y - that.pagesY[that.currPageY]);
            sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
            that.currPageY = page;
    
            // Snap with constant speed (proportional duration)
            time = m.round(m.max(sizeX, sizeY)) || 200;
    
            return { x: x, y: y, time: time };
        },
    
        _bind: function (type, el, bubble) { 
            (el || this.scroller).addEventListener(type, this, !!bubble);
        },
    
        _unbind: function (type, el, bubble) { 
            (el || this.scroller).removeEventListener(type, this, !!bubble);
        },
    
    
        /** * * Public methods * */
        destroy: function () { 
            var that = this;
    
            that.scroller.style[transform] = '';
    
            // Remove the scrollbars
            that.hScrollbar = false;
            that.vScrollbar = false;
            that._scrollbar('h');
            that._scrollbar('v');
    
            // Remove the event listeners
            that._unbind(RESIZE_EV, window);
            that._unbind(START_EV);
            that._unbind(MOVE_EV, window);
            that._unbind(END_EV, window);
            that._unbind(CANCEL_EV, window);
    
            if (!that.options.hasTouch) {
                that._unbind('DOMMouseScroll');
                that._unbind('mousewheel');
            }
    
            if (that.options.useTransition) that._unbind(TRNEND_EV);
    
            if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);
    
            if (that.options.onDestroy) that.options.onDestroy.call(that);
        },
    
        refresh: function () { 
            var that = this,
                offset,
                i, l,
                els,
                pos = 0,
                page = 0;
    
            if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
            that.wrapperW = that.wrapper.clientWidth || 1;
            that.wrapperH = that.wrapper.clientHeight || 1;
    
            that.minScrollY = -that.options.topOffset || 0;
            that.scrollerW = m.round(that.scroller.offsetWidth * that.scale);
            that.scrollerH = m.round((that.scroller.offsetHeight + that.minScrollY) * that.scale);
            that.maxScrollX = that.wrapperW - that.scrollerW;
            that.maxScrollY = that.wrapperH - that.scrollerH + that.minScrollY;
            that.dirX = 0;
            that.dirY = 0;
    
            if (that.options.onRefresh) that.options.onRefresh.call(that);
    
            that.hScroll = that.options.hScroll && that.maxScrollX < 0;
            that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);
    
            that.hScrollbar = that.hScroll && that.options.hScrollbar;
            //that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;
            that.vScrollbar = that.vScroll && that.options.vScrollbar;//yubai8 2016-10-31
    
            offset = that._offset(that.wrapper);
            that.wrapperOffsetLeft = -offset.left;
            that.wrapperOffsetTop = -offset.top;
    
            // Prepare snap
            if (typeof that.options.snap == 'string') {
                that.pagesX = [];
                that.pagesY = [];
                els = that.scroller.querySelectorAll(that.options.snap);
                for (i=0, l=els.length; i<l; i++) {
                    pos = that._offset(els[i]);
                    pos.left += that.wrapperOffsetLeft;
                    pos.top += that.wrapperOffsetTop;
                    that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
                    that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
                }
            } else if (that.options.snap) {
                that.pagesX = [];
                while (pos >= that.maxScrollX) {
                    that.pagesX[page] = pos;
                    pos = pos - that.wrapperW;
                    page++;
                }
                if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];
    
                pos = 0;
                page = 0;
                that.pagesY = [];
                while (pos >= that.maxScrollY) {
                    that.pagesY[page] = pos;
                    pos = pos - that.wrapperH;
                    page++;
                }
                if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];
            }
    
            // Prepare the scrollbars
            that._scrollbar('h');
            that._scrollbar('v');
    
            if (!that.zoomed) {
                that.scroller.style[transitionDuration] = '0';
                that._resetPos(400);
            }
        },
    
        scrollTo: function (x, y, time, relative) { 
            var that = this,
                step = x,
                i, l;
    
            that.stop();
    
            if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];
    
            for (i=0, l=step.length; i<l; i++) {
                if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }
                that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
            }
    
            that._startAni();
        },
    
        scrollToElement: function (el, time) { 
            var that = this, pos;
            el = el.nodeType ? el : that.scroller.querySelector(el);
            if (!el) return;
    
            pos = that._offset(el);
            pos.left += that.wrapperOffsetLeft;
            pos.top += that.wrapperOffsetTop;
    
            pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
            pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
            time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;
    
            that.scrollTo(pos.left, pos.top, time);
        },
    
        scrollToPage: function (pageX, pageY, time) { 
            var that = this, x, y;
    
            time = time === undefined ? 400 : time;
    
            if (that.options.onScrollStart) that.options.onScrollStart.call(that);
    
            if (that.options.snap) {
                pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;
                pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;
    
                pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;
                pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;
    
                that.currPageX = pageX;
                that.currPageY = pageY;
                x = that.pagesX[pageX];
                y = that.pagesY[pageY];
            } else {
                x = -that.wrapperW * pageX;
                y = -that.wrapperH * pageY;
                if (x < that.maxScrollX) x = that.maxScrollX;
                if (y < that.maxScrollY) y = that.maxScrollY;
            }
    
            that.scrollTo(x, y, time);
        },
    
        disable: function () { 
            this.stop();
            this._resetPos(0);
            this.enabled = false;
    
            // If disabled after touchstart we make sure that there are no left over events
            this._unbind(MOVE_EV, window);
            this._unbind(END_EV, window);
            this._unbind(CANCEL_EV, window);
        },
    
        enable: function () { 
            this.enabled = true;
        },
    
        stop: function () { 
            if (this.options.useTransition) this._unbind(TRNEND_EV);
            else cancelFrame(this.aniTime);
            this.steps = [];
            this.moved = false;
            this.animating = false;
        },
    
        zoom: function (x, y, scale, time) { 
            var that = this,
                relScale = scale / that.scale;
    
            if (!that.options.useTransform) return;
    
            that.zoomed = true;
            time = time === undefined ? 200 : time;
            x = x - that.wrapperOffsetLeft - that.x;
            y = y - that.wrapperOffsetTop - that.y;
            that.x = x - x * relScale + that.x;
            that.y = y - y * relScale + that.y;
    
            that.scale = scale;
            that.refresh();
    
            that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
            that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;
    
            that.scroller.style[transitionDuration] = time + 'ms';
            that.scroller.style[transform] = 'translate(' + that.x + 'px,' + that.y + 'px) scale(' + scale + ')' + translateZ;
            that.zoomed = false;
        },
    
        isReady: function () { 
            return !this.moved && !this.zoomed && !this.animating;
        }
    };
    
    function prefixStyle (style) { 
        if ( vendor === '' ) return style;
    
        style = style.charAt(0).toUpperCase() + style.substr(1);
        return vendor + style;
    }
    
    dummyStyle = null;  // for the sake of it
    
    if (typeof exports !== 'undefined') exports.iScroll = iScroll;
    else window.iScroll = iScroll;
    
    })(window, document);

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