常用javascript方法封装

墨蓝 2021-09-07 06:14 489阅读 0赞

1、输入一个值，返回其数据类型

  1. function type(para) {
  2.     return Object.prototype.toString.call(para)
  3. }

2、数组去重

  1. function unique1(arr) {
  2.     return [...new Set(arr)]
  3. }
  5. function unique2(arr) {
  6.     var obj = {};
  7.     return arr.filter(ele => {
  8.         if (!obj[ele]) {
  9.             obj[ele] = true;
  10.             return true;
  11.         }
  12.     })
  13. }
  15. function unique3(arr) {
  16.     var result = [];
  17.     arr.forEach(ele => {
  18.         if (result.indexOf(ele) == -1) {
  19.             result.push(ele)
  20.         }
  21.     })
  22.     return result;
  23. }

3、字符串去重

  1. String.prototype.unique = function () {
  2.     var obj = {},
  3.         str = '',
  4.         len = this.length;
  5.     for (var i = 0; i < len; i++) {
  6.         if (!obj[this[i]]) {
  7.             str += this[i];
  8.             obj[this[i]] = true;
  9.         }
  10.     }
  11.     return str;
  12. }
  14. ###### //去除连续的字符串 
  15. function uniq(str) {
  16.     return str.replace(/(\w)\1+/g, '$1')
  17. }

4、深拷贝 浅拷贝

  1. //深克隆（深克隆不考虑函数）
  2. function deepClone(obj, result) {
  3.     var result = result || {};
  4.     for (var prop in obj) {
  5.         if (obj.hasOwnProperty(prop)) {
  6.             if (typeof obj[prop] == 'object' && obj[prop] !== null) {
  7.                 // 引用值(obj/array)且不为null
  8.                 if (Object.prototype.toString.call(obj[prop]) == '[object Object]') {
  9.                     // 对象
  10.                     result[prop] = {};
  11.                 } else {
  12.                     // 数组
  13.                     result[prop] = [];
  14.                 }
  15.                 deepClone(obj[prop], result[prop])
  16.     } else {
  17.         // 原始值或func
  18.         result[prop] = obj[prop]
  19.     }
  20.   }
  21. }
  22. return result;
  23. }
  25. // 深浅克隆是针对引用值
  26. function deepClone(target) {
  27.     if (typeof (target) !== 'object') {
  28.         return target;
  29.     }
  30.     var result;
  31.     if (Object.prototype.toString.call(target) == '[object Array]') {
  32.         // 数组
  33.         result = []
  34.     } else {
  35.         // 对象
  36.         result = {};
  37.     }
  38.     for (var prop in target) {
  39.         if (target.hasOwnProperty(prop)) {
  40.             result[prop] = deepClone(target[prop])
  41.         }
  42.     }
  43.     return result;
  44. }
  45. // 无法复制函数
  46. var o1 = jsON.parse(jsON.stringify(obj1));

5、reverse底层原理和扩展

  1. // 改变原数组
  2. Array.prototype.myReverse = function () {
  3.     var len = this.length;
  4.     for (var i = 0; i < len; i++) {
  5.         var temp = this[i];
  6.         this[i] = this[len - 1 - i];
  7.         this[len - 1 - i] = temp;
  8.     }
  9.     return this;
  10. }

6、圣杯模式的继承

  1. function inherit(Target, Origin) {
  2.     function F() {};
  3.     F.prototype = Origin.prototype;
  4.     Target.prototype = new F();
  5.     Target.prototype.constructor = Target;
  6.     // 最终的原型指向
  7.     Target.prop.uber = Origin.prototype;
  8. }

7、找出字符串中第一次只出现一次的字母

  1. String.prototype.firstAppear = function () {
  2.     var obj = {},
  3.         len = this.length;
  4.     for (var i = 0; i < len; i++) {
  5.         if (obj[this[i]]) {
  6.             obj[this[i]]++;
  7.         } else {
  8.             obj[this[i]] = 1;
  9.         }
  10.     }
  11.     for (var prop in obj) {
  12.        if (obj[prop] == 1) {
  13.          return prop;
  14.        }
  15.     }
  16. }

8、找元素的第n级父元素

  1. function parents(ele, n) {
  2.     while (ele && n) {
  3.         ele = ele.parentElement ? ele.parentElement : ele.parentNode;
  4.         n--;
  5.     }
  6.     return ele;
  7. }

9、 返回元素的第n个兄弟节点

  1. function retSibling(e, n) {
  2.     while (e && n) {
  3.         if (n > 0) {
  4.             if (e.nextElementSibling) {
  5.                 e = e.nextElementSibling;
  6.             } else {
  7.                 for (e = e.nextSibling; e && e.nodeType !== 1; e = e.nextSibling);
  8.             }
  9.             n--;
  10.         } else {
  11.             if (e.previousElementSibling) {
  12.                 e = e.previousElementSibling;
  13.             } else {
  14.                 for (e = e.previousElementSibling; e && e.nodeType !== 1; e = e.previousElementSibling);
  15.             }
  16.             n++;
  17.         }
  18.     }
  19.     return e;
  20. }

10、封装mychildren，解决浏览器的兼容问题

  1. function myChildren(e) {
  2.     var children = e.childNodes,
  3.         arr = [],
  4.         len = children.length;
  5.     for (var i = 0; i < len; i++) {
  6.         if (children[i].nodeType === 1) {
  7.             arr.push(children[i])
  8.         }
  9.     }
  10.     return arr;
  11. }

11、判断元素有没有子元素

  1. function hasChildren(e) {
  2.     var children = e.childNodes,
  3.         len = children.length;
  4.     for (var i = 0; i < len; i++) {
  5.         if (children[i].nodeType === 1) {
  6.             return true;
  7.         }
  8.     }
  9.     return false;
  10. }

12、我一个元素插入到另一个元素的后面

  1. Element.prototype.insertAfter = function (target, elen) {
  2.     var nextElen = elen.nextElenmentSibling;
  3.     if (nextElen == null) {
  4.         this.appendChild(target);
  5.     } else {
  6.         this.insertBefore(target, nextElen);
  7.     }
  8. }

13、返回当前的时间（年月日时分秒）

  1. function getDateTime() {
  2.     var date = new Date(),
  3.         year = date.getFullYear(),
  4.         month = date.getMonth() + 1,
  5.         day = date.getDate(),
  6.         hour = date.getHours() + 1,
  7.         minute = date.getMinutes(),
  8.         second = date.getSeconds();
  9.         month = checkTime(month);
  10.         day = checkTime(day);
  11.         hour = checkTime(hour);
  12.         minute = checkTime(minute);
  13.         second = checkTime(second);
  14.      function checkTime(i) {
  15.         if (i < 10) {
  16.                 i = "0" + i;
  17.        }
  18.       return i;
  19.     }
  20.     return "" + year + "年" + month + "月" + day + "日" + hour + "时" + minute + "分" + second + "秒"
  21. }

14、获得滚动条的滚动距离

  1. function getScrollOffset() {
  2.     if (window.pageXOffset) {
  3.         return {
  4.             x: window.pageXOffset,
  5.             y: window.pageYOffset
  6.         }
  7.     } else {
  8.         return {
  9.             x: document.body.scrollLeft + document.documentElement.scrollLeft,
  10.             y: document.body.scrollTop + document.documentElement.scrollTop
  11.         }
  12.     }
  13. }

15、获得视口的尺寸

  1. function getViewportOffset() {
  2.     if (window.innerWidth) {
  3.         return {
  4.             w: window.innerWidth,
  5.             h: window.innerHeight
  6.         }
  7.     } else {
  8.         // ie8及其以下
  9.         if (document.compatMode === "BackCompat") {
  10.             // 怪异模式
  11.             return {
  12.                 w: document.body.clientWidth,
  13.                 h: document.body.clientHeight
  14.             }
  15.         } else {
  16.             // 标准模式
  17.             return {
  18.                 w: document.documentElement.clientWidth,
  19.                 h: document.documentElement.clientHeight
  20.             }
  21.         }
  22.     }
  23. }

16、获取任一元素的任意属性

  1. function getStyle(elem, prop) {
  2.     return window.getComputedStyle ? window.getComputedStyle(elem, null)[prop] : elem.currentStyle[prop]
  3. }

17、绑定事件的兼容代码

  1. function addEvent(elem, type, handle) {
  2.     if (elem.addEventListener) { //非ie和非ie9
  3.         elem.addEventListener(type, handle, false);
  4.     } else if (elem.attachEvent) { //ie6到ie8
  5.         elem.attachEvent('on' + type, function () {
  6.             handle.call(elem);
  7.         })
  8.     } else {
  9.         elem['on' + type] = handle;
  10.     }
  11. }

18、解绑事件

  1. function removeEvent(elem, type, handle) {
  2.     if (elem.removeEventListener) { //非ie和非ie9
  3.         elem.removeEventListener(type, handle, false);
  4.     } else if (elem.detachEvent) { //ie6到ie8
  5.         elem.detachEvent('on' + type, handle);
  6.     } else {
  7.         elem['on' + type] = null;
  8.     }
  9. }

19、取消冒泡的兼容代码

  1. function stopBubble(e) {
  2.     if (e && e.stopPropagation) {
  3.         e.stopPropagation();
  4.     } else {
  5.         window.event.cancelBubble = true;
  6.     }
  7. }

20、检验字符串是否是回文

  1. function isPalina(str) {
  2.     if (Object.prototype.toString.call(str) !== '[object String]') {
  3.         return false;
  4.     }
  5.     var len = str.length;
  6.     for (var i = 0; i < len / 2; i++) {
  7.         if (str[i] != str[len - 1 - i]) {
  8.             return false;
  9.         }
  10.     }
  11.     return true;
  12. }

21、检验字符串是否是回文

  1. function isPalindrome(str) {
  2.     str = str.replace(/\W/g, '').toLowerCase();
  3.     console.log(str)
  4.     return (str == str.split('').reverse().join(''))
  5. }

22、兼容getElementsByClassName方法

  1. Element.prototype.getElementsByClassName = Document.prototype.getElementsByClassName = function (_className) {
  2.     var allDomArray = document.getElementsByTagName('*');
  3.     var lastDomArray = [];
  4.     function trimSpace(strClass) {
  5.         var reg = /\s+/g;
  6.         return strClass.replace(reg, ' ').trim()
  7.     }
  8.     for (var i = 0; i < allDomArray.length; i++) {
  9.         var classArray = trimSpace(allDomArray[i].className).split(' ');
  10.         for (var j = 0; j < classArray.length; j++) {
  11.             if (classArray[j] == _className) {
  12.                 lastDomArray.push(allDomArray[i]);
  13.                 break;
  14.             }
  15.         }
  16.     }
  17.     return lastDomArray;
  18. }

23、运动函数

  1. function animate(obj, json, callback) {
  2.     clearInterval(obj.timer);
  3.     var speed,
  4.         current;
  5.     obj.timer = setInterval(function () {
  6.         var lock = true;
  7.         for (var prop in json) {
  8.             if (prop == 'opacity') {
  9.                 current = parseFloat(window.getComputedStyle(obj, null)[prop]) * 100;
  10.             } else {
  11.                 current = parseInt(window.getComputedStyle(obj, null)[prop]);
  12.             }
  13.             speed = (json[prop] - current) / 7;
  14.             speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
  16.             if (prop == 'opacity') {
  17.                 obj.style[prop] = (current + speed) / 100;
  18.             } else {
  19.                 obj.style[prop] = current + speed + 'px';
  20.             }
  21.             if (current != json[prop]) {
  22.                 lock = false;
  23.             }
  24.         }
  25.         if (lock) {
  26.             clearInterval(obj.timer);
  27.             typeof callback == 'function' ? callback() : '';
  28.         }
  29.     }, 30)
  30. }

24、弹性运动

  1. function ElasticMovement(obj, target) {
  2.     clearInterval(obj.timer);
  3.     var iSpeed = 40,
  4.         a, u = 0.8;
  5.     obj.timer = setInterval(function () {
  6.         a = (target - obj.offsetLeft) / 8;
  7.         iSpeed = iSpeed + a;
  8.         iSpeed = iSpeed * u;
  9.         if (Math.abs(iSpeed) <= 1 && Math.abs(a) <= 1) {
  10.             console.log('over')
  11.             clearInterval(obj.timer);
  12.             obj.style.left = target + 'px';
  13.         } else {
  14.             obj.style.left = obj.offsetLeft + iSpeed + 'px';
  15.         }
  16.     }, 30);
  17. }

25、封装自己的forEach方法

  1. Array.prototype.myForEach = function (func, obj) {
  2.     var len = this.length;
  3.     var _this = arguments[1] ? arguments[1] : window;
  4.     // var _this=arguments[1]||window;
  5.     for (var i = 0; i < len; i++) {
  6.         func.call(_this, this[i], i, this)
  7.     }
  8. }

26、封装自己的filter方法

  1. Array.prototype.myFilter = function (func, obj) {
  2.     var len = this.length;
  3.     var arr = [];
  4.     var _this = arguments[1] || window;
  5.     for (var i = 0; i < len; i++) {
  6.         func.call(_this, this[i], i, this) && arr.push(this[i]);
  7.     }
  8.     return arr;
  9. }

27、数组map方法

  1. Array.prototype.myMap = function (func) {
  2.     var arr = [];
  3.     var len = this.length;
  4.     var _this = arguments[1] || window;
  5.     for (var i = 0; i < len; i++) {
  6.         arr.push(func.call(_this, this[i], i, this));
  7.     }
  8.     return arr;
  9. }

28、数组every方法

  1. Array.prototype.myEvery = function (func) {
  2.     var flag = true;
  3.     var len = this.length;
  4.     var _this = arguments[1] || window;
  5.     for (var i = 0; i < len; i++) {
  6.         if (func.apply(_this, [this[i], i, this]) == false) {
  7.             flag = false;
  8.             break;
  9.         }
  10.     }
  11.     return flag;
  12. }

29、数组reduce方法

  1. Array.prototype.myReduce = function (func, initialValue) {
  2.     var len = this.length,
  3.         nextValue,
  4.         i;
  5.     if (!initialValue) {
  6.         // 没有传第二个参数
  7.         nextValue = this[0];
  8.         i = 1;
  9.     } else {
  10.         // 传了第二个参数
  11.         nextValue = initialValue;
  12.         i = 0;
  13.     }
  14.     for (; i < len; i++) {
  15.         nextValue = func(nextValue, this[i], i, this);
  16.     }
  17.     return nextValue;
  18. }

30、获取url中的参数

  1. function getWindonHref() {
  2.     var sHref = window.location.href;
  3.     var args = sHref.split('?');
  4.     if (args[0] === sHref) {
  5.         return '';
  6.     }
  7.     var hrefarr = args[1].split('#')[0].split('&');
  8.     var obj = {};
  9.     for (var i = 0; i < hrefarr.length; i++) {
  10.         hrefarr[i] = hrefarr[i].split('=');
  11.         obj[hrefarr[i][0]] = hrefarr[i][1];
  12.     }
  13.     return obj;
  14. }

31、数组排序

  1. // 快排 [left] + min + [right]
  2. function quickArr(arr) {
  3.     if (arr.length <= 1) {
  4.         return arr;
  5.     }
  6.     var left = [],
  7.         right = [];
  8.     var pIndex = Math.floor(arr.length / 2);
  9.     var p = arr.splice(pIndex, 1)[0];
  10.     for (var i = 0; i < arr.length; i++) {
  11.         if (arr[i] <= p) {
  12.             left.push(arr[i]);
  13.         } else {
  14.             right.push(arr[i]);
  15.         }
  16.     }
  17.     // 递归
  18.     return quickArr(left).concat([p], quickArr(right));
  19. }
  21. // 冒泡
  22. function bubbleSort(arr) {
  23.     for (var i = 0; i < arr.length - 1; i++) {
  24.         for (var j = i + 1; j < arr.length; j++) {
  25.             if (arr[i] > arr[j]) {
  26.                 var temp = arr[i];
  27.                 arr[i] = arr[j];
  28.                 arr[j] = temp;
  29.             }
  30.         }
  31.     }
  32.     return arr;
  33. }
  35. function bubbleSort(arr) {
  36.     var len = arr.length;
  37.     for (var i = 0; i < len - 1; i++) {
  38.         for (var j = 0; j < len - 1 - i; j++) {
  39.             if (arr[j] > arr[j + 1]) {
  40.                 var temp = arr[j];
  41.                 arr[j] = arr[j + 1];
  42.                 arr[j + 1] = temp;
  43.             }
  44.         }
  45.     }
  46.     return arr;
  47. }

32、遍历Dom树

  1. // 给定页面上的DOM元素,将访问元素本身及其所有后代(不仅仅是它的直接子元素)
  2. // 对于每个访问的元素，函数讲元素传递给提供的回调函数
  3. function traverse(element, callback) {
  4.     callback(element);
  5.     var list = element.children;
  6.     for (var i = 0; i < list.length; i++) {
  7.         traverse(list[i], callback);
  8.     }
  9. }

33、原生js封装ajax

  1. function ajax(method, url, callback, data, flag) {
  2.     var xhr;
  3.     flag = flag || true;
  4.     method = method.toUpperCase();
  5.     if (window.XMLHttpRequest) {
  6.         xhr = new XMLHttpRequest();
  7.     } else {
  8.         xhr = new ActiveXObject('Microsoft.XMLHttp');
  9.     }
  10.     xhr.onreadystatechange = function () {
  11.         if (xhr.readyState == 4 && xhr.status == 200) {
  12.             console.log(2)
  13.             callback(xhr.responseText);
  14.         }
  15.     }
  17.     if (method == 'GET') {
  18.         var date = new Date(),
  19.         timer = date.getTime();
  20.         xhr.open('GET', url + '?' + data + '&timer' + timer, flag);
  21.         xhr.send()
  22.         } else if (method == 'POST') {
  23.         xhr.open('POST', url, flag);
  24.         xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
  25.         xhr.send(data);
  26.     }
  27. }

34、异步加载script

  1. function loadScript(url, callback) {
  2.     var oscript = document.createElement('script');
  3.     if (oscript.readyState) { // ie8及以下版本
  4.         oscript.onreadystatechange = function () {
  5.             if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {
  6.                 callback();
  7.             }
  8.         }
  9.     } else {
  10.         oscript.onload = function () {
  11.             callback()
  12.         };
  13.     }
  14.     oscript.src = url;
  15.     document.body.appendChild(oscript);
  16. }

35、cookie管理

  1. var cookie = {
  2.     set: function (name, value, time) {
  3.         document.cookie = name + '=' + value + '; max-age=' + time;
  4.         return this;
  5.     },
  6.     remove: function (name) {
  7.         return this.setCookie(name, '', -1);
  8.     },
  9.     get: function (name, callback) {
  10.         var allCookieArr = document.cookie.split('; ');
  11.         for (var i = 0; i < allCookieArr.length; i++) {
  12.             var itemCookieArr = allCookieArr[i].split('=');
  13.             if (itemCookieArr[0] === name) {
  14.                 return itemCookieArr[1]
  15.             }
  16.         }
  17.         return undefined;
  18.     }
  19. }

36、实现bind()方法

  1. Function.prototype.myBind = function (target) {
  2.     var target = target || window;
  3.     var _args1 = [].slice.call(arguments, 1);
  4.     var self = this;
  5.     var temp = function () {};
  6.     var F = function () {
  7.         var _args2 = [].slice.call(arguments, 0);
  8.         var parasArr = _args1.concat(_args2);
  9.         return self.apply(this instanceof temp ? this : target, parasArr)
  10.     }
  11.     temp.prototype = self.prototype;
  12.     F.prototype = new temp();
  13.     return F;
  14. }

37、实现call()方法

  1. Function.prototype.myCall = function () {
  2.     var ctx = arguments[0] || window;
  3.     ctx.fn = this;
  4.     var args = [];
  5.     for (var i = 1; i < arguments.length; i++) {
  6.         args.push(arguments[i])
  7.     }
  8.     var result = ctx.fn(...args);
  9.     delete ctx.fn;
  10.     return result;
  11. }

38、实现apply()方法

  1. Function.prototype.myApply = function () {
  2.     var ctx = arguments[0] || window;
  3.     ctx.fn = this;
  4.     if (!arguments[1]) {
  5.         var result = ctx.fn();
  6.         delete ctx.fn;
  7.         return result;
  8.     }
  9.     var result = ctx.fn(...arguments[1]);
  10.     delete ctx.fn;
  11.     return result;
  12. }

39、防抖

  1. function debounce(handle, delay) {
  2.     var timer = null;
  3.     return function () {
  4.         var _self = this,
  5.             _args = arguments;
  6.         clearTimeout(timer);
  7.         timer = setTimeout(function () {
  8.             handle.apply(_self, _args)
  9.         }, delay)
  10.     }
  11. }

40、节流

  1. function throttle(handler, wait) {
  2.     var lastTime = 0;
  3.     return function (e) {
  4.         var nowTime = new Date().getTime();
  5.         if (nowTime - lastTime > wait) {
  6.             handler.apply(this, arguments);
  7.             lastTime = nowTime;
  8.         }
  9.     }
  10. }

41、requestAnimFrame兼容性方法

  1. window.requestAnimFrame = (function () {
  2.     return window.requestAnimationFrame ||
  3.         window.webkitRequestAnimationFrame ||
  4.         window.mozRequestAnimationFrame ||
  5.         function (callback) {
  6.             window.setTimeout(callback, 1000 / 60);
  7.         };
  8. })();

42、cancelAnimFrame兼容性方法

  1. window.cancelAnimFrame = (function () {
  2.     return window.cancelAnimationFrame ||
  3.         window.webkitCancelAnimationFrame ||
  4.         window.mozCancelAnimationFrame ||
  5.         function (id) {
  6.             window.clearTimeout(id);
  7.         };
  8. })();

43、jsonp底层方法

  1. function jsonp(url, callback) {
  2.     var oscript = document.createElement('script');
  3.     if (oscript.readyState) { // ie8及以下版本
  4.         oscript.onreadystatechange = function () {
  5.             if (oscript.readyState === 'complete' || oscript.readyState === 'loaded') {
  6.                 callback();
  7.             }
  8.         }
  9.     } else {
  10.         oscript.onload = function () {
  11.             callback()
  12.         };
  13.     }
  14.     oscript.src = url;
  15.     document.body.appendChild(oscript);
  16. }

44、获取url上的参数

  1. function getUrlParam(sUrl, sKey) {
  2.     var result = {};
  3.     sUrl.replace(/(\w+)=(\w+)(?=[&|#])/g, function (ele, key, val) {
  4.         if (!result[key]) {
  5.             result[key] = val;
  6.         } else {
  7.             var temp = result[key];
  8.             result[key] = [].concat(temp, val);
  9.         }
  10.     })
  11.     if (!sKey) {
  12.         return result;
  13.     } else {
  14.         return result[sKey] || '';
  15.     }
  16. }

45、格式化时间

  1. function formatDate(t, str) {
  2.     var obj = {
  3.         yyyy: t.getFullYear(),
  4.         yy: ("" + t.getFullYear()).slice(-2),
  5.         M: t.getMonth() + 1,
  6.         MM: ("0" + (t.getMonth() + 1)).slice(-2),
  7.         d: t.getDate(),
  8.         dd: ("0" + t.getDate()).slice(-2),
  9.         H: t.getHours(),
  10.         HH: ("0" + t.getHours()).slice(-2),
  11.         h: t.getHours() % 12,
  12.         hh: ("0" + t.getHours() % 12).slice(-2),
  13.         m: t.getMinutes(),
  14.         mm: ("0" + t.getMinutes()).slice(-2),
  15.         s: t.getSeconds(),
  16.         ss: ("0" + t.getSeconds()).slice(-2),
  17.         w: ['日', '一', '二', '三', '四', '五', '六'][t.getDay()]
  18.     };
  19.     return str.replace(/([a-z]+)/ig, function ($1) {
  20.         return obj[$1]
  21.     });
  22. }

46、验证邮箱的正则表达式

  1. function isAvailableEmail(sEmail) {
  2.     var reg = /^([\w+\.])+@\w+([.]\w+)+$/
  3.     return reg.test(sEmail)
  4. }

47、函数柯里化

  1. //是把接受多个参数的函数变换成接受一个单一参数(最初函数的第一个参数)的函数，并且返回接受余下的参数且返回结果的新函数的技术
  3. function curryIt(fn) {
  4.     var length = fn.length,
  5.         args = [];
  6.     var result = function (arg) {
  7.         args.push(arg);
  8.         length--;
  9.         if (length <= 0) {
  10.             return fn.apply(this, args);
  11.         } else {
  12.             return result;
  13.         }
  14.     }
  15.     return result;
  16. }

48、大数相加

  1. function sumBigNumber(a, b) {
  2.     var res = '', //结果
  3.         temp = 0; //按位加的结果及进位
  4.     a = a.split('');
  5.     b = b.split('');
  6.     while (a.length || b.length || temp) {
  7.         //~~按位非 1.类型转换，转换成数字 2.~~undefined==0 
  8.         temp += ~~a.pop() + ~~b.pop();
  9.         res = (temp % 10) + res;
  10.         temp = temp > 9;
  11.     }
  12.     return res.replace(/^0+/, '');
  13. }

49、单例模式

  1. function getSingle(func) {
  2.     var result;
  3.     return function () {
  4.         if (!result) {
  5.             result = new func(arguments);
  6.         }
  7.         return result;
  8.     }
  9. }

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