js json与对象的相互转换

var str = '{ "name": "cxh", "sex": "man" }'; //JSON字符串:
var obj =  JSON.parse(str);; //由JSON字符串转换为JSON对象
console.log(obj)

var str2 = { "name": "cxh", "sex": "man" }; //JSON对象
var last=JSON.stringify(obj); //将JSON对象转化为JSON字符
console.log(last);