1、Array.map()

2、//新增陣列IndexOf方法

就是在使用indexOf方法前，驗證一下是否存在該方法IndexOf方法，如果有呼叫；如果沒有就新增一個：

if (!Array.prototype.indexOf) { Array.prototype.indexOf = function (num) { var len = this.length >>> 0;
var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); if (from < 0) from += len;
for (; from < len; from++) { if (from in this && this[from] === num) return from; } return -1; }; }