json数据取值问题

[joeyhacker]

数据是从后台返回的,内容: 类型是JSON的
{"types":[{"st_id":1,"st_name":"图书","st_info":"图书信息","subtypes":[{"t_id":3,"t_name":"网球","t_info":"网球类的图书","g_size":0},{"t_id":2,"t_name":"台球","t_info":"台球类的图书","g_size":0}]},{"st_id":4,"st_name":"音乐","st_info":"音乐信息","subtypes":[]}]}

我的在前台这样分别取到st_name这些值呢?

[mumu_java]

一般会用一个js的框架（如extjs）中的某一个控件来读取(如extjs中的reader).

[hzrui]

var str = '{"types":[{"st_id":1,"st_name":"图书","st_info":"图书信息","subtypes":[{"t_id":3,"t_name":"网球","t_info":"网球类的图书","g_size":0},{"t_id":2,"t_name":"台球","t_info":"台球类的图书","g_size":0}]},{"st_id":4,"st_name":"音乐","st_info":"音乐信息","subtypes":[]}]}';

eval("var s = " + str);

alert(s. st_name);

[「已注销」]

eval（"返回的Json对象字符串就行了"）
至于那个变量定义好像放在函数外面更好一点。

[tobyzhou]

var obj = eval('(' + Your Json Exp + ')');
var types = obj.types;
for(i=0;i<types.length;i++){
alert(types[i].st_id);
}