微信H5网页常用的JS操作

超、凢脫俗 2023-05-31 15:19 142阅读 0赞

> **更新时间：2019-12-11  亲测可用**

### 一、禁止浏览器回退/返回  ###

// 禁止浏览器回退/返回
    function banReturn() {
        XBack = {};
        (function (XBack) {
            XBack.STATE = 'x - back';
            XBack.element;
            XBack.onPopState = function (event) {
                event.state === XBack.STATE && XBack.fire();
                XBack.record(XBack.STATE); //初始化事件时，push一下
            };
            XBack.record = function (state) {
                history.pushState(state, null, location.href);
            };
            XBack.fire = function () {
                var event = document.createEvent('Events');
                event.initEvent(XBack.STATE, false, false);
                XBack.element.dispatchEvent(event);
            };
            XBack.listen = function (listener) {
                XBack.element.addEventListener(XBack.STATE, listener, false);
            };
            XBack.init = function () {
                XBack.element = document.createElement('span');
                window.addEventListener('popstate', XBack.onPopState);
                XBack.record(XBack.STATE);
            };
        })(XBack);
        XBack.init();
        XBack.listen(function () { });
    }

### 二、监听浏览器返回/离开 ###

// 监听浏览器返回离开事件， 必须先有history.pushState() 才能使用这个这 popstate 方法监听
    window.addEventListener("popstate", function(e) {
        console.log("我监听到页面离开了")
        // window.location.href = 'XXX'; // 可以指定返回哪一个页面。或者做其他业务相关的逻辑操作
    }, false);
    
    // 该方法添加了一个历史记录，路径为#，保证了不刷新页面，不直接后退。
    pushHistory();
    function pushHistory() { 
        var state = {
            title: "title", // 这可以随意填写
            url: "#"
        };
        window.history.pushState(state, "title", "#");
    }

## ##

### 三、关闭微信浏览器页面 ###

//关闭微信浏览器页面
    function weixinClosePage() {
        if (typeof WeixinJSBridge == "undefined") {
            if (document.addEventListener) {
                document.addEventListener('WeixinJSBridgeReady', weixin_ClosePage, false);
            } else if (document.attachEvent) {
                document.attachEvent('WeixinJSBridgeReady', weixin_ClosePage);
                document.attachEvent('onWeixinJSBridgeReady', weixin_ClosePage);
            }
        } else {
            WeixinJSBridge.call('closeWindow');
        }
    }

## ##

### 四、修改默认的alert弹框 ###

// 修改默认的alert弹框
    window.alert = function (name) {
        var iframe = document.createElement("IFRAME");
        iframe.style.display = "none";
        iframe.setAttribute("src", 'data:text/plain,');
        document.documentElement.appendChild(iframe);
        window.frames[0].window.alert(name);
        iframe.parentNode.removeChild(iframe);
    };

### 五、获取地址栏的参数 ###

// 获取地址栏的参数
    function getQueryString(name) {
        var reg = new RegExp("(^|&)" + name + "=([^&]*)(&|$)", "i");
        var r = window.location.search.substr(1).match(reg);
        if (r != null)
            return unescape(r[2]);
        return null;
    }

### 六、cookie增删改查 ###

// 获取cookie
    function getCookie(cname) {
        var name = cname + "=";
        var decodedCookie = decodeURIComponent(document.cookie);
        var ca = decodedCookie.split(';');
        for(var i = 0; i <ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1);
             }
             if (c.indexOf(name) == 0) {
                return c.substring(name.length, c.length);
             }
         }
        return "";
    }
    		
    // 设置cookie 或修改cookie
    function setCookie(objName, objValue, objDays) {
        var str = objName + "=" + escape(objValue);
        if(objDays > 0) {
            // objDays 单位天 
            var date = new Date();
            var ms = objDays * 24 * 3600 * 1000;
            date.setTime(date.getTime() + ms);
            str += "; expires=" + date.toGMTString();
        }
    	
        // 永久保存
        if(objDays === Infinity){
            str += "; expires=Fri, 31 Dec 9999 23:59:59 GMT";
        }
    	
        str += "; path=/";
        document.cookie = str;
    };
    
    // 删除cookie
    function delCookie(objName) {
        // 设置为过去的日期即可删除
        document.cookie = objName + "=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
    }