屏掉F5刷新的办法

 1<body onkeydown="KeyDown()">
 2
 3  
 4function KeyDown()   
 5{   
 6//屏蔽退格删除键,屏蔽 F5 刷新键,Ctrl + R   
 7if ((event.keyCode==116)||(event.ctrlKey &amp;&amp; event.keyCode==82))   
 8{   
 9event.keyCode=0;   
10event.returnValue=false;   
11}   
12}</body>
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