.append无法加载已有js文件，解决实例

js:

 1 /**
 2  * 
 3  */
 4  $(function(){
 5     $(document).on("click","a",function(){
 6                     alert("点击成功");
 7                 });
 8 
 9     $("#add").click(function(){
10     $("#mydiv").append("<a>点击</a>");
11     });
12 });

html:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <script type="text/javascript" src="assets/jquery-3.3.1.min.js"></script>
 7  <script type="text/javascript" src="test.js"></script>  
 8 <script type="text/javascript">
 9 </script>
10 </head>
11 <body>
12 
13 <a>点击</a><button id="add">add</button>
14 <div id="mydiv"></div>
15 </body>
16 </html>