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jQuery_动态加载css文件实现方法

发布时间：2023-09-06 01:29责任编辑：彭小芳关键词：jQuery

有时我们可能会需要使用 jQuery 来加载一个外部的 css 文件，如在切换页面布局时。思路是创建一个 link 元素，并将它添加到 标记中即可，下边首先看看怎么使用 jQuery 来实现。

下边是我喜欢的写法：

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$("<link>")
.attr({ rel: "stylesheet",
type: "text/css",
href: "site.css"
})
.appendTo("head");

有些朋友可能会使用下边的写法，只是形式有些小差异(append appendTo)，原理还是一样的。

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$("head").append("<link>");
css = $("head").children(":last");
css.attr({
rel: "stylesheet",
type: "text/css",
href: "/Content/Site.css"
});

最后，有的朋友可能希望直接在 javascript 中使用，方法如下：

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function addCSS() {
var link = document.createElement(‘link‘);
link.type = ‘text/css‘;
link.rel = ‘stylesheet‘;
link.href = ‘/Content/Site.css‘;
document.getElementsByTagName("head")[0].appendChild(link);
}

如果是在 web 交互时，我们可以使用上述的方法通过 jQuery 或者 javascript 来引入一个 css 文件，否则还是建议使用原始的方法。

下面我还介绍一个可加载js,css的实例

代码如下

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$.extend({
includePath: ‘‘,
include: function(file) {
var files = typeof file == "string" ? [file]:file;
for (var i = 0; i < files.length; i++) {
var name = files[i].replace(/^s|s$/g, "");
var att = name.split(‘.‘);
var ext = att[att.length - 1].toLowerCase();
var isCSS = ext == "css";
var tag = isCSS ? "link" : "script";
var attr = isCSS ? " type=‘text/css‘ rel=‘stylesheet‘ " : " language=‘javascript‘ type=‘text/javascript‘ ";
var link = (isCSS ? "href" : "src") + "=‘" + $.includePath + name + "‘";
if ($(tag + "[" + link + "]").length == 0) document.write("<" + tag + attr + link + "></" + tag + ">");
}
}
});
//使用方法
$.includePath = ‘http://hi.xxx/javascript/‘;
$.include([‘json2.js‘, ‘jquery.tree.js‘, ‘jquery.tree.css‘]);

一个完整的实例

index.html

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<!-- Created by Barrett at RRPowered.com -->
<!-- File name index.html -->
<html>
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax
/libs/jquery/1.4.4/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="default.css">
<title>A simple jQuery image slide</title>
<script type="text/javascript">
$(function(){
$(".theme").click(function(){
var theme=$(this).attr("rel");
$("link").attr("href",$(this).attr(‘rel‘));
$("head").append("<link>");
});
});
</script>
</head>
<body>
<div class="theme" rel="blue.css">Blue</div>
<div class="theme" rel="orange.css">Orange</div>
<div class="theme" rel="yellow.css">Yellow</div>
<div class="theme" rel="default.css">Default</div>
<div class="container">
<div class="menu">Tab1 Tab2 Tab3 Tab4 Tab5</div>
<div class="inner">
Lorem ipsum dolor sit amet
</div>
<div class="footer">copyright yoursite 2011</div>
</div>
</body>
</html>
default.css
body{
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#ffffff;
font-family:"arial";
}
.theme{
margin:10px;
width:70px;
padding:5px;
text-align:center;
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#BEF781;
border:solid #333333 1px;
color:#444444;
font-weight:bold;
cursor:pointer;
}
.container{
margin-left:auto;
margin-right:auto;
width:700px;
}
.inner{
padding:20px;
border:solid #333333 1px;
}
.menu{
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#f2f2f2;
padding:10px;
font-weight:bold;
}
.footer{
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#f9f9f9;
padding:5px;
}
blue.css
body{
padding: 0px 0px 0px 5px; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial; border-left: 3px solid rgb(108, 226, 108); line-height: 20px; width: 640px; clear: both; border-radius: 0px !important; border-top: 0px !important; border-right: 0px !important; border-bottom: 0px !important; border-image: initial !important; bottom: auto !important; float: none !important; height: auto !important; left: auto !important; outline: 0px !important; overflow: visible !important; position: static !important; right: auto !important; top: auto !important; vertical-align: baseline !important; box-sizing: content-box !important; font-family: Consolas, "Bitstream Vera Sans Mono", "Courier New", Courier, monospace !important; min-height: auto !important; color: gray !important;">#2E9AFE;
font-family:"arial";
}
.theme{
margin:10px;

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