JSON数据解析

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从后台获取到一串JSON字符串数据

{"test1":[{"yl":"165.56","rq":"2015-12-16 15:02:00"},{"yl":"165.8","rq":"2015-12-16 15:03:00"},{"yl":"166.29","rq":"2015-12-16 15:04:00"},{"yl":"166.9","rq":"2015-12-16 15:05:00"}],"test2":[{"yl":"167","rq":"2015-12-16 15:01:00"},{"yl":"166.88","rq":"2015-12-16 15:02:00"},{"yl":"167.24","rq":"2015-12-16 15:03:00"},{"yl":"167.71","rq":"2015-12-16 15:04:00"},{"yl":"168.18","rq":"2015-12-16 15:05:00"}],"test3":[{"yl":"172.87","rq":"2015-12-16 14:05:00"},{"yl":"172.38","rq":"2015-12-16 14:06:00"},{"yl":"170.88","rq":"2015-12-16 14:07:00"},{"yl":"170.38","rq":"2015-12-16 14:08:00"},{"yl":"170.5","rq":"2015-12-16 14:09:00"}]}

在不知道名称的情况下，如何取test1,test2,test3

先把字符串转对象

var obj = eval("(" + result.d + ")");

获取obj长度

Object.keys(obj).length

获取obj名称

Object.keys(obj)[0]

获取obj里熟悉

obj[Object.keys(obj)[0]];

获取用

for (var item in a)

{ alert(item); //名称
alert(a[item].length);//里面属性长度

alert(a[item]);
}

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