页面写入与读取Cookie

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())}