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function window.onhelp(){return false}
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function document.onkeydown()
{
   if ((window.event.altKey)&&
   ((window.event.keyCode==37)|| //ÆÁ±Î Alt+ ·½Ïò¼ü ←
   (window.event.keyCode==39))) //ÆÁ±Î Alt+ ·½Ïò¼ü →
   {
    alert("²»×¼ÄãʹÓÃALT+·½Ïò¼üǰ½ø»òºóÍËÍøÒ³£¡");
    event.returnValue=false;
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   if ((event.keyCode==8)   ||                 //ÆÁ±ÎÍ˸ñɾ³ý¼ü
   (event.keyCode==116)||                 //ÆÁ±Î F5 ˢмü
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    event.keyCode=0;
    event.returnValue=false;
    }
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Javascript±Õ°ü(Closure)

ClosureÖÐÎÄ·­ÒëΪ±Õ°ü.×ÖÃæÉÏÀ´Àí½â¾ÍÊÇ"·â±ÕµÄ°ü".(ÕâÊÇÒ»¾ä·Ï»°)
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Javascript: setTimeout()ʹÓü° setInterval()ʹÓÃ

Evaluates an expression after a specified number of milliseconds has elapsed.
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Syntax:
iTimerID = window.setTimeout(vCode, iMilliSeconds [, sLanguage])
Parameters
vCode
Required. Variant that specifies the function pointer or string that indicates the code to be ......

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