Javascript操作cookie

设置cookie：

function setCookie(name,value,days,path){
        var t = new Date(),
                  sCookie= name + "=" + escape(value);
                  t.setTime(t.getTime()+days*24*3600*1000);
                 sCookie += ";expires="+t.toGMTString();
        if(path){
                sCookie += ";path="+path;
        }
        document.cookie = sCookie;
}

查询cookie：

function getCookie(name){
        var preg = new RegExp("(^| )"+name+"=([^;]*)(;|$)","g");
        if(preg.test(document.cookie)){
                return RegExp.$2;
        }else{
                return "";
        }
}

删除cookie：

function delCookie(name){
        setCookie(name,"",-1);
}

清空cookie：

function clearCookie(){
        var cookieArr = document.cookie.split(";");
        for(var i=0;i<cookieArr.length;i++){
                var preg = /([^;]*)=([^;]*)/;
                var match = preg.exec(document.cookie);
                delCookie(match[1]);
        }
}