获取当前本地时间Date

<script type="text/javascript">
  var mydate = new Date();
  var nian = mydate.getFullYear();
  var yue = mydate.getMonth()+1;
  var ri = mydate.getDate();
  var xingqi = mydate.getDay();
  switch(xingqi){
    case 0: xingqi = "星期日";break;
    case 1: xingqi = "星期一";break;
    case 2: xingqi = "星期二";break;
    case 3: xingqi = "星期三";break;
    case 4: xingqi = "星期四";break;
    case 5: xingqi = "星期五";break;
    case 6: xingqi = "星期六";break;
  }
  document.write("今天是"+nian+"年"+yue+"月"+ri+"日  "+xingqi);
</script>