<html xmlns=”http://www.w3.org/1999/xhtml”> <head> <title>Untitled Page</title> </head> <body> <div id="d">divvv</div> <div id="fsd">fdsf</div> </body> </html> <script type="text/javascript"> var myok = function(selector){ debugger; alert(typeof(this)); } var c = new myok(‘d‘); alert(c.constructor); //实现自己的MyQuery框架 var MyQuery = function(selector){ debugger; if ( window == this ) return new MyQuery(selector); //这里只实现dom类型的简单查找,嘿嘿 var doms = document.getElementsByTagName(selector); var arr = []; for(var i=0; i<doms .length; i++){ arr.push(doms.item(i)); } return this.setArray(arr); } MyQuery.prototype.setArray = function( arr ) { debugger; this.length = 0; [].push.apply( this, arr ); return this; } MyQuery.fn = MyQuery.prototype; var $ = MyQuery; //插件扩展1)each MyQuery.fn.each = function(method){ debugger; for(var i=0,l=this.length; i<l; i++){ method.call(this[i],i); } } //插件扩展2)show MyQuery.fn.show = function(){ debugger; this.each(function(i){ alert(i+":"+this.id+":"+this.innerHTML); }); } //debugger $("div").show(); </script>
原文：http://www.cnblogs.com/msdn1433/p/3534276.html