1     var Txt = ‘{"a":"1","b":"5","c":"5","d":"6"}‘;
 2     var arr1 = JSON.parse(Txt);
 3     console.log(arr1)
 4 //    Object {a: "1", b: "5", c: "5", d: "6"}
 5 //    parse转换的必须是正宗json值   如上
 6     var txt = {"a":"1","b":"5","c":"5","d":"6"};
 7     var arr = JSON.stringify(txt);
 8     console.log(arr)
 9 //    {"a":"1","b":"5","c":"5","d":"6"}
10 //    stringify可以正常转对象
11     var ttt = {a:"1",b:"5",c:"5",d:"6"}
12     var arr2 = Object.keys(ttt)
13     console.log(arr2)
14 //    ["a", "b", "c", "d"]
15 //    Object.keys吧对象值都拿出来