js读取与写入cookie的代码一例

<script language="javascript">
/**
 * 读取与写入cookie值
 * by http://www.jb200.com
*/
function writeCookie(name, value, hours){
var expire = "";
if(hours != null){
  expire = new Date((new Date()).getTime() + hours * 3600000);
  expire = "; expires=" + expire.toGMTString();
}
document.cookie = name + "=" + escape(value) + expire;
}

//读取cookie
function readCookie(name){
var cookieValue = "";
var search = name + "=";
if(document.cookie.length > 0){
  offset = document.cookie.indexOf(search);
  if (offset != -1){
   offset += search.length;
   end = document.cookie.indexOf(";", offset);
   if (end == -1) end = document.cookie.length;
   cookieValue = unescape(document.cookie.substring(offset, end))
  }
}
return cookieValue;
}
</script>