如何var(…)使用JavaScript(plain或jQuery)获取和设置CSS自定义属性(在样式表中访问的属性)？
这是我不成功的尝试:单击按钮更改常用font-weight属性,但不更改自定义--mycolor属性:
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.0/jquery.min.js"></script>
<style>
body {
--mycolor: yellow;
background-color: var(--mycolor);
}
</style>
</head>
<body>
<p>Let's try to make this text bold and the background red.</p>
<button onclick="plain_js()">Plain JS</button>
<button onclick="jQuery_()">jQuery</button>
<script>
function plain_js() {
document.body.style['font-weight'] = 'bold';
document.body.style['--mycolor'] = 'red';
};
function jQuery_() {
$('body').css('font-weight', 'bold');
$('body').css('--mycolor', 'red');
}
</script>
</body>
</html>
如此处所定义:
http://www.w3.org/TR/CSS21/generate.html#propdef-counter-increment
您可以使用以下代码来增加伪元素中的数字.
H1:before {
content: "Chapter " counter(chapter) ". ";
counter-increment: chapter; /* Add 1 to chapter */
}
H1 {
counter-reset: section; /* Set section to 0 */
}
H2:before {
content: counter(chapter) "." counter(section) " ";
counter-increment: section;
}
有没有办法可以使用相同的代码来增加像"a","b","c"等字母？
谢谢!