JS method to declare a series of (multiple) variables at the same time

This article mainly introduces you to the method of using Javascript to declare a series (that is, multiple) variables. Friends in need can refer to it. Let’s take a look. .

Preface

js declares multiple variables at the same time. We believe that many friends will repeatedly use var to define, so how to implement it in a more scientific way? Well, let's take a look at an article about how to declare variables in js. The specific details are as follows.

I won’t go into the method of declaring variables in JS. Friends who need to learn can click on this article.

We often need to declare several variables in a row. When I was a novice, I did this.

var a=1;
var b={};
var c=[];
var d=...

In fact, we can do this:

var a=1,b=2,c=3,d=4;

That is, use, to separate multiple variables.

This situation without line breaks is only suitable for situations where the variable value is relatively single. If your variable is a function or object, then line breaks are required:

var a=function (){
 var b,c,d;
},
b = {
 b:1,
 a:2
};

This way you can keep writing and maintain good readability. Of course, remember to end with;.

In addition, I want to mention here that I have used several JS compression tools recently, and they are all smart, but they are still not smart enough to automatically merge multiple vars in multiple lines. It becomes a var, so if you want to compress your JS, it is best to use this continuous declaration method. jQuery etc. all use this.

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