js判斷是否爲空對象{}

1、ES6的Object.keys()方法

var data = {};
var arr = Object.keys(data);
alert(arr.length == 0);//true

2、json對象轉化爲json字符串

var data = {};
var b = (JSON.stringify(data) == "{}");
alert(b);//true

3、jquery的isEmptyObject方法

var data = {};
var b = $.isEmptyObject(data);
alert(b);//true

4、Object.getOwnPropertyNames()方法

var data = {};
var arr = Object.getOwnPropertyNames(data);
alert(arr.length == 0);//true