var date = new Date();  // 实例化日期对象  

  var timeStr = '';//日期 

  timeStr = date.getFullYear() + "年" ;  

  timeStr += date.getMonth() + 1 +"月";  

  timeStr += date.getDate()+"日";  

  var day  = date.getDay(); //星期 

  var week = '';

  switch(day){

case  0 :

week  = '星期一';

break;

case  1 :

week  = '星期二';

break;

case  2 :

week  = '星期三';

break;

case  3 :

week  = '星期四';

break;

case  4 :

week  = '星期五';

break;

case  5 :

week  = '星期六';

break;

case  6 :

week  = '星期天';

break; 

  }

  timeStr += " "+week;

  //打印出日期

  document.write(timeStr);

这段代码只要一行document.write()输出就够了啊？这样

document.write(date.getFullYear()+"年"+(date.getMonth()+1)+"月"+"星期"+date.getDay());