javascript - square shape won't disappear when clicked on -

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i don't know why shape won't disappear when clicked. wrote correct code down disappearing function. wrote code displays green square , should disappear when clicked not. here is:

<html>     <head>                 <title>javascript</title>                <style type="text/css">              #shape{              width:200px;         height:200px;         background-color:green;              }                </style>         </head>     <body>       <div id ="shape">     oo       </div>          <script type="text/javascript">              var start=new date().gettime();              document.getelementbyid("shape").onclick=function(){                 document.getelementbyid("shape").style.display="none";               var end=new date().gettime();                var time=end-start;         alert(time);         }         </script>             </body> </html>

i think has browser

your document.getelementbyid("shape").style.display="none"; on line 38 has changed document.getelementbyid("shape").style.display="none";

you have see error in browser js-console.

uncaught typeerror: document.getelementbyid not function


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