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js的Array对象的处理能力比较强大，下面几个函数是给它再新增几个扩展方法使其更方便使用
部分方法在最新版Webkit已经实现，但由于IE8等低端浏览器还占有大批用户，所以还得实现一遍，另外splice不是很方便使用，个人感觉用insert、remove方法更直观
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | //数组处理程序 if (!Array.prototype.forEach) { Array.prototype.forEach = function (callback, thisArg) { var T, k; if (this == null) { throw new TypeError(" this is null or not defined"); } var O = Object(this); var len = O.length >>> 0; // Hack to convert O.length to a UInt32 if ({}.toString.call(callback) != "[object Function]") { throw new TypeError(callback + " is not a function"); } if (thisArg) { T = thisArg; } k = 0; while (k < len) { var kValue; if (k in O) { kValue = O[k]; callback.call(T, kValue, k, O); } k++; } }; } //查询数组中是否存在元素 if (!Array.prototype.in_array) { Array.prototype.in_array = function (e) { for (i = 0; i < this.length; i++) { if (this[i] == e) return true; } return false; } } //插入元素 if (!Array.prototype.insert) { Array.prototype.insert = function (index, elem) { return this.splice(index, 0, elem); } } //删除元素 if (!Array.prototype.remove) { Array.prototype.remove = function (index) { return this.splice(index, 1); } } |
