function setCookie(name,value){

    var Days = ;

    var exp = new Date();

    exp.setTime(exp.getTime() + Days****);

    document.cookie = name + "="+ escape (value) + ";expires=" + exp.toGMTString();

}

function getCookie(name){

    var arr,reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)");

    if(arr=document.cookie.match(reg)){

        return unescape(arr[]);

    }else{

        return null;

    }

}

function delCookie(name){

    var exp = new Date();

    exp.setTime(exp.getTime() - );

    var cval=getCookie(name);

    if(cval!=null){

        document.cookie= name + "="+cval+";expires="+exp.toGMTString();

    }

}

　　　　　　 function clearAllCookie() {

                var date=new Date();

                date.setTime(date.getTime()-);

                var keys=document.cookie.match(/[^ =;]+(?=\=)/g);

                console.log("需要删除的cookie名字："+keys);

                if (keys) {

                    for (var i =  keys.length; i--;)

                      document.cookie=keys[i]+"=0; expire="+date.toGMTString()+"; path=/";

                }

            }