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:
$("<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。
$("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:
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
$.extend({includePath: '',include: function(file) {var files = typeof file == "string" ? [file]:file;for (var i = 0; i < files.length; i++) {var name = files[i].replace(/^s|s$/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/'; $.include(['json2.js', 'jquery.tree.js', 'jquery.tree.css']);
一个完整的实例
index.html
<!-- Created by Barrett at RRPowered.com --><!-- File name index.html --><html><head><script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script><link rel="stylesheet" type="text/css" href="default.css"><title>A simple jQuery image slide</title><script type="text/javascript">$(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.cssbody{background-color:#ffffff;font-family:"arial";}.theme{margin:10px;width:70px;padding:5px;text-align:center;background-color:#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{background-color:#f2f2f2;padding:10px;font-weight:bold;}.footer{background-color:#f9f9f9;padding:5px;}blue.cssbody{background-color:#2E9AFE;font-family:"arial";}.theme{margin:10px;width:70px;padding:5px;text-align:center;background-color:#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;background-color:#58ACFA;color:#ffffff;}.menu{background-color:#f2f2f2;padding:10px;font-weight:bold;}.footer{background-color:#f9f9f9;padding:5px;}yellow.cssbody{background-color:#F7FE2E;font-family:"arial";}.theme{margin:10px;width:70px;padding:5px;text-align:center;background-color:#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;background-color:#f6f6f6;}.menu{background-color:#F2F5A9;padding:10px;font-weight:bold;}.footer{background-color:#F2F5A9;padding:5px;}orange.cssbody{background-color:#FE9A2E;font-family:"arial";}.theme{margin:10px;width:70px;padding:5px;text-align:center;background-color:#BEF781;border:solid #333333 1px;color:#444444;font-weight:bold;cursor:pointer;}.container{margin-left:auto;margin-right:auto;width:700px;}.inner{padding:20px;background-color:#F7BE81;color:#404040;}.menu{background-color:#ffffff;padding:10px;font-weight:bold;color:#FFBF26;}.footer{background-color:#ffffff;padding:5px;color:#FFBF26;}
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