Javascript操作Cookie

<SCRIPT type=text/javascript> 
function SetCookie(name,value)  
{  
 var D1 = new Date();  
 D1.setTime(D1.getTime() + 1*3600000 ); //小时  
 document.cookie = name+"="+value+";expires="+ D1.toGMTString();  
}  
function GetCookie(name)  
{  
 var cookieString = new String(document.cookie);  
 var cookieHeader = name+"=";  
 var beginPosition = cookieString.indexOf(cookieHeader)  
 if (beginPosition != -1)//cookie已经设置值 
 {  
   return cookieString.substring(beginPosition + cookieHeader.length);  
 }  
 else //cookie没有设置值 
 {  
  return null;
  }  
}  
function DelCookie(Cookie_name)  
{  
 document.cookie = Cookie_name+"=;expires=Fri, 02-Jan-1970 00:00:00 GMT";  
}  
</SCRIPT> 
<P> 
<INPUT onclick="SetCookie('Woody','good')" type=button value=设置cookie值><P> 
<INPUT onclick="alert(GetCookie('Woody'));" type=button value=查看cookie值><P> 
<INPUT onclick="DelCookie('Woody')" type=button value=清除cookie值><PRE></PRE>

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