// 扩展Array对象函数
      
  Array.prototype.find = function (func) {
            var temp = [];
            for (var i = 0; i < this.length; i++) {
                if (func(this[i])) {
                    temp[temp.length] = this[i];
                }
            }
            return temp;
        }

var arr = [{ id: 1, name: "aa" }, { id: 2, name: "bb" }, { id: 3, name: "cc"}];
        //Array.find函数用法
        var a2 = arr.find(function (obj) {
            return obj.id > 2;
        });

// 返回符合条件的 a2 = { id: 3, name: "cc"};
alert(a2.id)

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