用JavaScript修改CSS选择器：after

Question

How do I access or modify pseudo-selectors like :after and :hover of CSS of an element through JavaScript (please no jQuery). 如何通过JavaScript访问或修改元素CSS的伪选择器，如：after和：hover （请不要使用jQuery）。

Example 例

<!DOCTYPE HTML>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
        <title>Progress bar example</title>
        <style type="text/css">
        .progressbar
        {
            position: relative;
            width: 100px;
            height: 10px;
            background-color: red;
        }

        .progressbar:after
        {
            content: "";
            position: absolute;
            width: 25%;
            height: 100%;
            background-color: blue;
        }
        </style>
    </head>

    <body>
        <div id="progressbar" class="progressbar" onclick="this.style.width='90%';"></div>
    </body>
</html>

Like you see I want to use somethink like a progress bar, so I can't simply exchange/add/remove a second class to an element. 就像您看到的那样，我想使用进度条之类的东西，所以我不能简单地将第二个类交换/添加/删除到元素。 I would like to access the the width property of the progressbar:after (with the :after selector) class directly through JS. 我想直接通过JS访问progressbar：after （使用：after选择器）类的width属性。 But how? 但是如何？

Answer 1

You could give this a try: 您可以尝试一下：

EDITED EDITED

//create new style element
var style = document.createElement("style");

//append the style
document.head.appendChild(style);

//take the stylesheet object
sheet = style.sheet

//add the rule to your stylesheet -- changed this line to .insertRule
sheet.insertRule('.progressbar::after { width: 50% }', 0);

Updated fiddle 更新的小提琴

用JavaScript修改CSS选择器：after

问题描述

1 个解决方案

解决方案1
0 2014-11-12 01:57:21

用JavaScript修改CSS选择器：after

问题描述

1 个解决方案

解决方案1 0 2014-11-12 01:57:21

解决方案1
0 2014-11-12 01:57:21