jquery日期格式化

function dateFormat(date, format){

    date = new Date();
    var map = {
        "YY": date.getYear(),
        "M": date.getMonth() + 1, //月份
        "d": date.getDate(), //日
        "h": date.getHours(), //小时
        "m": date.getMinutes(), //分
        "s": date.getSeconds(), //秒  
        "q": Math.floor((date.getMonth() + 3) / 3), //季度
        "S": date.getMilliseconds() //毫秒
    };

    format = format.replace(/([YMdhmsqS])+/g, function(all, t){
        var v = map[t];
        if (v !== undefined) {
            if (all.length > 1) {
                v = "0" + v;
                v = v.substr(v.length - 2);
            }
            return v;
        }
        else if (t === "Y") {
            return (date.getFullYear() + "").substr(4 - all.length);
        }
        return all;
    });
    return format;
}
 

 var nowdate = dateFormat(Date(),'YYYY-MM-dd');

alert(nowdate);