js 获取当前日期时间

function today(){
    var today=new Date();
    var h=today.getFullYear();
    var m=today.getMonth()+1;
    var d=today.getDate();
    var hh=today.getHours();
    var mm=today.getMinutes();
    var ss=today.getSeconds();
    m= m<10?"0"+m:m;     
    d= d<10?"0"+d:d;
    hh = hh < 10 ? "0" + hh:hh;
    mm = mm < 10 ? "0" +  mm:mm;
    ss = ss < 10 ? "0" + ss:ss;
    return h+"-"+m+"-"+d+" "+hh+":"+mm+":"+ss;
}