javasctipt Array.find 对象函数用法

javasctipt  Array.find 对象函数用法

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ere are three ways of defining an array:

var myfriends=new Array() //1) regular array. Pass an optional integer argument to control array's size.
myfriends[0]="John"
myfriends[1]="Bob"
myfriends[2]="Sue"
var myfriends=new Array("John", "Bob", "Sue") //2) condensed array
var myfriends=["John", "Bob", "Sue"] //3) literal array

下面看实例
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 > 1;
        });
        alert(a2.length);

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