How to judge empty string in jquery

The method of judging the empty string in jquery: 1. Judge by judging whether the length of the string is 0; 2. Judge by judging whether the string is equal to null, undefined, etc. The code is [if(str ==null||str==undefined||str=="")].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version. This method is suitable for all brands of computers.

How to judge the empty string in jquery:

1. By judging whether the length of the string is 0

 if(str.length==0){
//代码
}

2. By Determine whether the string is equal to null, undefined, etc.

if(str==null||str==undefined||str==""){
//代码
}

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