一个简单的动态加载js和css的jquery代码，用于在生成页面时通过js函数加载一些共通的js和css文件。
//how to use the function below: //$.include('file/ajaxa.js');$.include('file/ajaxa.css'); //or $.includePath = 'file/';$.include(['ajaxa.js','ajaxa.css']);(only if .js and .css files are in the same directory) $.extend({ includePath: '', include: function(file) { var files = typeof file == "string" ? [file] : file; for (var i = 0; i < files.length; i++) { var name = files[i].replace(/^s|s$/g, ""); var att = name.split('.'); var ext = att[att.length - 1].toLowerCase(); var isCSS = ext == "css"; var tag = isCSS "script"; var attr = isCSS " type='text/css' rel='stylesheet' " : " type='text/javascript' "; var link = (isCSS ") + "='" + $.includePath + name + "'"; if ($(tag + "[" + link + "]").length == 0) $("head").prepend("<" + tag + attr + link + "></" + tag + ">"); } } }); $.include('../js/jquery-ui-1.8.21.custom.min.js'); $.include('../css/black-tie/jquery-ui-1.8.21.custom.css');
将该函数写入一个common.js文件中，在html中加载该common.js文件，就可以达到目的。
注意：
1.在html5中，<script>标签已经不支持language属性了，所以我删除了：
var attr = isCSS " type='text/css' rel='stylesheet' " : " language='javascript' type='text/javascript' ";
中的language='javascript'
2.原作者在写入js和css标签时，用的是：
document.write("<" + tag + attr + link + "></" + tag + ">");
但是经过实践，发现document.write（）方法会在写入前清除原页面的所有内容，也就相当于覆盖的意思，这样明显达不到我的需要，我需要在加载页面时动态的向页面导入共通的js和css，而不能清除我原页面的其他任何内容，所以查了下api，我改用了：
$("head").prepend("<" + tag + attr + link + "></" + tag + ">");
这个方法，$("head").prepend（）方法的作用是在<head>标签的最前端追加写入内容。
最后，再补充一个方法，也是通过共通js来实现，应该比上面这个方法更容易理解：
Dynamically loading external JavaScript and CSS files To load a .js or .css file dynamically, in a nutshell, it means using DOM methods to first create a swanky new "SCRIPT" or "LINK" element, assign it the appropriate attributes, and finally, use element.appendChild() to add the element to the desired location within the document tree. It sounds a lot more fancy than it really is. Lets see how it all comes together: function loadjscssfile(filename, filetype){ if (filetype=="js"){ //if filename is a external JavaScript file var fileref=document.createElement('script') fileref.setAttribute("type","text/javascript") fileref.setAttribute("src", filename) } else if (filetype=="css"){ //if filename is an external CSS file var fileref=document.createElement("link") fileref.setAttribute("rel", "stylesheet") fileref.setAttribute("type", "text/css") fileref.setAttribute("href", filename) } if (typeof fileref!="undefined") document.getElementsByTagName("head")[0].appendChild(fileref) } loadjscssfile("myscript.js", "js") //dynamically load and add this .js file loadjscssfile("javascript.php", "js") //dynamically load "javascript.php" as a JavaScript file loadjscssfile("mystyle.css", "css") ////dynamically load and add this .css file