案例：JavaScript案例     状态：可编辑再运行    进入竖版
 运行结果　
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<html>
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<head>
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<script type="text/javascript">
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function getCookie(c_name)
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{
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if (document.cookie.length>0)
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{
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c_start=document.cookie.indexOf(c_name + "=")
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if (c_start!=-1)
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{
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c_start=c_start + c_name.length+1
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c_end=document.cookie.indexOf(";",c_start)
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if (c_end==-1) c_end=document.cookie.length
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return unescape(document.cookie.substring(c_start,c_end))
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}
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}
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return ""
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}
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​
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function setCookie(c_name,value,expiredays)
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{
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var exdate=new Date()
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exdate.setDate(exdate.getDate()+expiredays)
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document.cookie=c_name+ "=" +escape(value)+
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((expiredays==null) ? "" : "; expires="+exdate.toGMTString())
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}
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​
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function checkCookie()
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{
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username=getCookie('username')
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if (username!=null && username!="")
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  {alert('Welcome again '+username+'!')}
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else
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  {
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  username=prompt('Please enter your name:',"")
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  if (username!=null && username!="")
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    {
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    setCookie('username',username,365)
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    }
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  }
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}
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</script>
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</head>
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<body onLoad="checkCookie()">
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</body>
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</html>
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​