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：

1 var goods1={"barcode":"122124545124","buyPrice":122,"color":"白色","id":7713,"isDelete":false,"lastedSaleTime":"2013-07-25 14:25:42","name":"黑色毛衣","page":0,"remark":"","rows":0,"showPrice":122,"size":"L","total":0,"type":"12112B","unit":"件"};
2
3 var goods2='{"barcode":"12454545454","buyPrice":133,"color":"黑色","id":7714,"isDelete":false,"lastedSaleTime":"2013-07-25 14:27:39","name":"春天幻想","page":0,"remark":"","rows":0,"showPrice":133,"size":"M","total":0,"type":"B","unit":"条"}';

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：

1 var goods1={"barcode":"122124545124","buyPrice":122,"color":"白色","id":7713,"isDelete":false,"lastedSaleTime":"2013-07-25 14:25:42","name":"黑色毛衣","page":0,"remark":"","rows":0,"showPrice":122,"size":"L","total":0,"type":"12112B","unit":"件"};
2
3 var goods2='{"barcode":"12454545454","buyPrice":133,"color":"黑色","id":7714,"isDelete":false,"lastedSaleTime":"2013-07-25 14:27:39","name":"春天幻想","page":0,"remark":"","rows":0,"showPrice":133,"size":"M","total":0,"type":"B","unit":"条"}';

04
05 var goods1ToStr=JSON.stringify(goods1);
06
07 var goods2ToObj=JSON.parse(goods2);
08
09 alert(typeof(goods1ToStr));  //string
10
11 alert(typeof(goods2ToObj));//object

JSON.stringify()

ie8(兼容模式),ie7和ie6没有JSON对象，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，

1 var c='{"name":"Mike","sex":"女","age":"29"}';
2 var cToObj=eval("("+c+")");
3 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