`

js 设置cookie

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