json是种常用数据传输格式，js怎么解析json格式的数据呢，请参阅下面的代码：
1. <html>
2. <head>
3. <script type="text/javascript">
4. data = '{"return_code":0,"return_message":"success","data":{"data":[{"id":"1","question":"公主令牌在哪交？"},{"id":"2","question":"公主护使有什么用？"},{"id":"3","question":"角斗场在哪？"},{"id":"4","question":"北部断层在哪？"},{"id":"5","question":"欢乐令有什么用？"},{"id":"6","question":"令牌积分有什么用？"},{"id":"7","question":"南部断层在哪？"},{"id":"8","question":"大妖魔令牌交给谁？"},{"id":"9","question":"神工坊在哪？"},{"id":"10","question":"警戒妖珠有什么用？"}]}}';
5.
6. function ShowData(){
7.
8. obj = eval（"("+data+")");
9.
10. alert("return_code:"+obj["return_code"]);
11. alert("return_message:"+obj["return_message"]);
12. alert("第一个问题id：" + obj["data"]["data"][0]["id"]);
13. alert("第一个内容id：" + obj["data"]["data"][0]["question"]);
14. }
15.
16. </script>
17. </head>
18.
19. <body onload="ShowData();">
20. {"return_code":0,"return_message":"success","data":{"data":[{"id":"1","question":"公主令牌在哪交？"},{"id":"2","question":"公主护使有什么用？"},{"id":"3","question":"角斗场在哪？"},{"id":"4","question":"北部断层在哪？"},{"id":"5","question":"欢乐令有什么用？"},{"id":"6","question":"令牌积分有什么用？"},{"id":"7","question":"南部断层在哪？"},{"id":"8","question":"大妖魔令牌交给谁？"},{"id":"9","question":"神工坊在哪？"},{"id":"10","question":"警戒妖珠有什么用？"}]}}
21.
22. </body>
23.
24. </html>
