How to add style in javascript

How to add styles in javascript: 1. Through the "document.getElementById("box");" method; 2. Through the "head.style.cssText="..."" method; 3. Using setProperty method.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to add styles in javascript?

js adds css style

The following is a simple case:

We want to add a div with the id of box style. We're going to add width, height, background color to it.

Method 1:

var head= document.getElementById("box"); //获取到id为box的div标签元素。
head.style.width = "70px"; //设置宽度为70
head.style.height = "70px";//设置高度为70
head.style.display = "#ccc";//设置背景色为灰色

This method is relatively simple, but if there are many CSS styles, such as margin, padding, font-size, etc., then we still write like this , that would be a lot. At this time, we can use method two.

Method 2:

var head= document.getElementById("box");//获取到id为box的div标签元素。
head.style.cssText="width:70px;height:70px;display:#ccc";

In this method, we use "cssText", so we greatly reduce the code. Just like writing in a CSS source file.

Method 3: Use setProperty

element.style.setProperty('height', '300px', 'important');

If you want to set !important, it is recommended to use this method to set the third parameter

Recommended learning: "javascript Advanced Tutorial 》

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