js获取年月日

<script>

function sj(a) {

var dd= new Date();

dd.setDate(dd.getDate()+a);//获取AddDayCount天后的日期

var y = dd.getFullYear();

var m = dd.getMonth()+1;//获取当前月份的日期

var d = dd.getDate();

return y+"年"+m+"月"+d+"日";

}

document.write("前天："+sj(-2));

document.write("<br />昨天："+sj(-1));

document.write("<br />今天："+sj(0));

document.write("<br />明天："+sj(1));

document.write("<br />后天："+sj(2));

document.write("<br />大后天："+sj(3)+"<br/>");

</script>