javascript 伪数组和数组转换

    function ArrayExtend() {
        this.ArrayExtend = "";
    }

    ArrayExtend.prototype = {
        jqObjToArray: function (Obj) {
            var slice = Array.prototype.slice;
            return slice.call(Obj, 0);
        },
        ArrayToJqObj: function (ary) {
            var obj = {}, push = Array.prototype.push;
            push.apply(obj, ary);
            return obj;
        }
    }

        var jqObj = {
            0: 'tsp',
            1: 'sp',
            2: '_tsp',
            length: 3
        },
           ary = ['tsp', 'sp', '_tsp'];

        var arry = new ArrayExtend();
        console.log(arry.jqObjToArray(jqObj));
        console.log(arry.ArrayToJqObj(ary));　　

运行结果：

 js apply 和call介绍：这里借鉴网上找的几篇文章 分享下

http://www.cnitblog.com/yemoo/archive/2007/11/30/37070.aspx

http://www.cnblogs.com/snandy/archive/2011/06/08/2074086.html

http://www.cnblogs.com/sunwangji/archive/2006/08/21/482341.html

 

这篇对学习过net的或者java的朋友理解起来比前面的3片 或许好点：

http://ll-feng.iteye.com/blog/599108

 

附加：josn转化数组 利用js for in

var arr = [];
var tsp ={ "a": "tsp", "b":"sp", "c": "_sp" }
  for(var itme in tsp ){
     if(tsp[itme]!==undefined){
       arr.push(tsp[itme]);
     }
  }
3
for(var i=0;i<arr.length;i++){console.log(arr[i])}

求个数：不推荐object上扩展

            var arry = [{
                t1: 1,
                t2: 2,
                t3: 2
            }, {
                t1: 1,
                t2: 2
            }];
            Object.prototype.count = function(){
                var i = 0;
                for (var x in this) {
                
                    this.hasOwnProperty(x) && i++;
                }
                return i;
            };

结果：