js怎么获得系统当前的时间，要求是XXXX-XX-XX XX:XX:XX格式的

js怎么获得系统当前的时间，要求是XXXX-XX-XX XX:XX:XX格式的

追问多谢！

var date = new Date();
var dd = date.getFullYear()+"-" + formatDate(date.getMonth()+1) + "-" + formatDate(date.getDate());

var hours = date.getHours() < 10?(0 + date.getHours()) : date.getHours();
var minutes = date.getMinutes() < 10?(0 + date.getMinutes()) : date.getMinutes();
var seconds = date.getSeconds() < 10?(0 + date.getSeconds()) : date.getSeconds();

dd = dd + " " + hours + ":" + minutes + ":" + seconds;
alert(dd );

function formatDate(val){
var valFormate = val;
if(valFormate<10){
valFormate = "0"+valFormate;
}
return valFormate;
}