How to determine whether an object is empty in jquery

Jquery method to determine whether an object is empty: 1. Use the dom object to determine if it is zero. If it is zero, it is empty, and the code is [obj.length == 0]; 2. Use a custom object to determine, the code is [ $.isEmptyObject()].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer.

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Jquery method to determine whether an object is empty:

1. One It is a dom object

The dom object will have a length attribute, so in this case:

　　obj.length == 0

You can judge that the object is empty

2. One is a custom object

such as var obj = {}. In this case, the object defined will not have a length attribute.

You need to use the jquery method: $ .isEmptyObject()

　　if($.isEmptyObject(obj) == true){
　　　　console.log("对象为空");
　　}else{
　　　　console.log("对象非空");
　　}

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