angular2.js:2 Uncaught ReferenceError: System is not defined

1、错误描述

angular2.js:2 Uncaught ReferenceError: System is not defined
    at angular2.js:2
(anonymous) @ angular2.js:2
http.js:2 Uncaught ReferenceError: System is not defined
    at http.js:2
(anonymous) @ http.js:2
model.html:14 Uncaught ReferenceError: angular is not defined
    at model.html:14
(anonymous) @ model.html:14

2、错误原因

<script type="text/javascript" src="../js/angular2.js" ></script>
<script type="text/javascript" src="../js/http.js" ></script>

       引入AngularJS2和http.js

3、解决办法