ie8 js编译器对象为空或不是对象的一个小问题

 1 var Workmodel=function(){
 2     model_json=[
 3         {"name":"工作台","state":"工作台说明","img_src":"res/images/icon1.png","_background":"rgb(21, 183, 211)","_url":"#"},
 4         {"name":"工作台","state":"工作台说明","img_src":"res/images/icon2.png","_background":"rgb(235, 73, 75)","_url":"#"},
 5         {"name":"工作台","state":"工作台说明","img_src":"res/images/icon3.png","_background":"rgb(230, 119, 27)","_url":"#"},
 6         {"name":"工作台","state":"工作台说明","img_src":"res/images/icon4.png","_background":"rgb(50, 50, 50)","_url":"#"},
 7     ];
 8     this.execute=function(){ 
 9         this.pElement=$("#right-top .content");
10         this.result="";
11         $.each(model_json,function(a,b){ 
12             result+='<div class="mod" style="background:'+b._background+'"><a href='+b._url+'><div class="mod-left"><div class="name">'+b.name+'</div><div class="text">'+b.state+'</div></div><div class="mod-icon"><img src='+b.img_src+' alt=""></div></a></div></div>';
13         });
14         this.pElement.html(result);
15     };
16     this.execute();
17 };