java 获取后台返回json 并js循环利用

<pre name="code" class="javascript"><pre name="code" class="javascript">             $(function() {
var menuString=$('#menuString').val();
alert(menuString);
//var menujson = $.parseJSON(menuString);
var menujson = eval('(' + menuString + ')');
alert(menujson);
//循环遍历数据
for(var o in menujson){
//alert(o);
//alert(menujson[o]);
alert("menu_parent_id:"+menujson[o].menu_parent_id+"menu_name:"+menujson[o].menu_ch+" menu_url:"+menujson[o].menu_url);
}

// 				   //var data=[{name:"a",age:12},{name:"b",age:11},{name:"c",age:13},{name:"d",age:14}];
// 				   var data=[{"name":"监控项切换","age":12},{"name":"b","age":11},{"name":"c","age":13},{"name":"d","age":14}];
// 			       for(var o in data){
// 			           alert(o);
// 			           alert(data[o]);
// 			           alert("name:"+data[o].name+" age:"+data[o].age );
// 			       }
}