JS模拟jQuery

 1 <!doctype html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>Document</title>
 6     <script type="text/javascript">
 7 
 8         (function(w){
 9             w.$ = function(){
10                 alert("======");
11             };
12         })(window);
13 
14         $();//相当于window.$();
15     </script>
16 </head>
17 <body>
18     
19 </body>
20 </html>
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