Detailed explanation of jquery dynamically loading js files

$.extend({
     
include
Path: '',
     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(&#39;.&#39;);
            var ext = att[att.length - 1].toLowerCase();
            var isCSS = ext == "css";
            var tag = isCSS ? "link" : "script";
            var attr = isCSS ? " type=&#39;text/css&#39; rel=&#39;stylesheet&#39; " : " language=&#39;
javascript
&#39; type=&#39;text/javascript&#39; ";
            var link = (isCSS ? "href" : "src") + "=&#39;" + $.includePath + name + "&#39;";
            if ($(tag + "[" + link + "]").length == 0) $("body").append("<" + tag + attr + link + "></" + tag + ">");
        }
   }
});
//使用方法
$.includePath = &#39;../js/Exam&#39;; 
$.include([&#39;/AddQuestion.js&#39;]);