function getCookie(c_name){    if (document.cookie.length>0){         console.log(document.cookie);        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 cookieStr = "";    var exdate=new Date();    exdate.setDate(exdate.getDate()+expiredays);    document.cookie = c_name+ "=" +escape(value)+    ((expiredays==null) ? "" : "; expires="+exdate.toGMTString())+";path=/";}//由于cookie存在域的概念，且在这里要不区分域，获取cookie的值，所以在这里使用的是统一的路径 path=/ ；

function delete_cookie( name, path, domain ) {  if( get_cookie( name ) ) {    document.cookie = name + "=" +      ((path) ? ";path="+path:"")+      ((domain)?";domain="+domain:"") +      ";expires=Thu, 01 Jan 1970 00:00:01 GMT";  }}

function delete_cookie( name ) {  document.cookie = name + ‘=; expires=Thu, 01 Jan 1970 00:00:01 GMT;‘;}

function delCookie(c_name) {     var exp = new Date();     exp.setTime(exp.getTime() - 1);     var cval=getCookie(c_name);    if(cval!=null)         document.cookie= c_name + "=;expires="+exp.toGMTString(); }