js json数组取值

<script type="text/javascript">
var a={};
a['a1']={"name":"zee","age":"27"};
a['a2']={"name":"lan","age":"26"};
a['a3']={"name":"wei","age":"33"};

for(var one in a){
    if(a[one]["name"]=="wei"){
        alert(a[one]["age"]);
    }
}


</script>