//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 ? "link" : "script"; 
var attr = isCSS ? " type='text/css' rel='stylesheet' " : " type='text/javascript' "; 
var link = (isCSS ? "href" : "src") + "='" + $.includePath + name + "'"; 
if ($(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');

將該函數(shù)寫入一個common.js文件中，在html中加載該common.js文件，就可以達(dá)到目的。
注意：
1.在html5中，<script>標(biāo)簽已經(jīng)不支持language屬性了，所以我刪除了：

var attr = isCSS ? " type='text/css' rel='stylesheet' " : " language='javascript' type='text/javascript' ";

中的language='javascript'
2.原作者在寫入js和css標(biāo)簽時，用的是：

document.write("<" + tag + attr + link + "></" + tag + ">");

但是經(jīng)過實踐，發(fā)現(xiàn)document.write（）方法會在寫入前清除原頁面的所有內(nèi)容，也就相當(dāng)于覆蓋的意思，這樣明顯達(dá)不到我的需要，我需要在加載頁面時動態(tài)的向頁面導(dǎo)入共通的js和css，而不能清除我原頁面的其他任何內(nèi)容，所以查了下api，我改用了：

$("head").prepend("<" + tag + attr + link + "></" + tag + ">");

這個方法，$("head").prepend（）方法的作用是在<head>標(biāo)簽的最前端追加寫入內(nèi)容。

最后，再補(bǔ)充一個方法，也是通過共通js來實現(xiàn)，應(yīng)該比上面這個方法更容易理解：

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

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