请问哪里出错了

来源：1-14 编程练习

theeyang

2018-10-31 12:27:44

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>打开/关闭页面</title>
    </head>
    <body>
       <input type="button" value="关闭本页面" id="close">
       <input type="button" value="打开慕课网" id="open">
       <script type="text/javascript">
           var close=document.getElementById("close");
           var open=document.getElementById("open");
           close.onclick=function(){
            window.close();
           }
           open.onclick=function(){
            window.open("http://www.imooc.com");
           }
       </script>
    </body>
</html>

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