//获取系统当前时间戳
var myDate = new Date();
var year = myDate.getFullYear();//年
var month = myDate.getMonth()+1;//月
if(month<=9){month='0'+month;}
var date = myDate.getDate();//日
if(date<=9){date='0'+date;}
var hour = myDate.getHours();//时
if(hour<=9){hour='0'+hour;}
var minute = myDate.getMinutes();//分
if(minute<=9){minute='0'+minute;}
var second = myDate.getSeconds();//秒
if(second<=9){second='0'+second;}
var millisecond = myDate.getMilliseconds();//毫秒
if(millisecond<=9){millisecond='00'+millisecond;}else if(millisecond<=99){millisecond='0'+millisecond;}
var nowtime = year+'-'+month+'-'+date+' '+hour+':'+minute+':'+second+'.'+millisecond;
nowtime = nowtime.substring(0,19);    
nowtime = nowtime.replace(/-/g,'/'); 
nowtime = new Date(nowtime).getTime();
alert(nowtime);