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var now = new Date();
alert(now.getYear()+"-"+((now.getMonth()+1)<10?"0":"")+(now.getMonth()+1)+"-"+(now.getDate()<10?"0":"")+now.getDate());
<script type="text/javascript">
Date.prototype.format = function(partten)
{
if(partten ==null||partten=='')
{
partten = 'y-m-d' ;
}
var y = this.getYear();
var m = this.getMonth()+1;
var d = this.getDate();
var r = partten.replace(/y+/gi,y);
r = r.replace(/m+/gi,(m<10?"0":"")+m);
r = r.replace(/d+/gi,(d<10?"0":"")+d);
return r;
}
//调用方式
alert((new Date()).format());
alert((new Date()).format("y-m-d"));
alert((new Date()).format("y/m/d"));
alert((new Date()).format("m/d/y"));
</script>
var d = new Date();
var str = d.getFullYear()+"-"+(d.getMonth()+1)+"-"+d.getDate();
alert(str)