JSON对象和字符串之间的相互转换

　　比如我有两个变量，我要将a转换成字符串，将b转换成JSON对象：

　　

　　var a={"name":"tom","sex":"男","age":"24"};

　　var b='{"name":"Mike","sex":"女","age":"29"}';

　　

　　在Firefox，chrome，opera，safari，ie9，ie8等高级浏览器直接可以用JSON对象的stringify()和parse()方法。

　　JSON.stringify(obj)将JSON转为字符串。JSON.parse(string)将字符串转为JSON格式;

　　上面的转换可以这么写：

　　

　　var a={"name":"tom","sex":"男","age":"24"};

　　var b='{"name":"Mike","sex":"女","age":"29"}';

　　var aToStr=JSON.stringify(a);

　　var bToObj=JSON.parse(b);

　　alert(typeof(aToStr)); //string

　　alert(typeof(bToObj));//object

　　

　　JSON.stringify()

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　　，不过http://www.json.org/提供了一个json.js,这样ie8(兼容模式),ie7和ie6就可以支持JSON对象以及其stringify()和parse()方法;你可以在https://github.com/douglascrockford/JSON-js上获取到这个js，一般现在用json2.js。

　　ie8(兼容模式),ie7和ie6可以使用eval()将字符串转为JSON对象，

　　

　　var c='{"name":"Mike","sex":"女","age":"29"}';

　　var cToObj=eval("("+c+")");

　　alert(typeof(cToObj));

　　

　　jQuery中也有将字符串转为JSON格式的方法jQuery.parseJSON( json )，接受一个标准格式的 JSON 字符串，并返回解析后的 JavaScript (JSON)对象。当然如果有兴趣可以自己封装一个jQuery扩展，jQuery.stringifyJSON(obj)将JSON转为字符串。