<script>
  //定义一个日期对象;
  var currentTime=new Date();
  //获得系统年份;
  var year=currentTime.getFullYear();
  //获得系统月份;
  var month=currentTime.getMonth();
  //获得系统当月分天数;
  var day=currentTime.getDate();
  //获得系统小时;
  var hours=currentTime.getHours();
  //获得系统分钟;
  var minutes=currentTime.getMinutes();
  //获得系统星期几;
  var dayCycle=currentTime.getDay();
  //使用数组更改日期样式;
  var dayCycleArray=["日","一","二","三","四","五","六"];
  for(var i=0;i<7;i++){
    if(dayCycle==i){
      //将dayCycleArray的数赋值到系统星期几里面中去;
      dayCycle=dayCycleArray[i];
    }
  }
  //打印完整的系统日期;
  document.write("<div class=\"div3\">"+year+"年"+month+"月"+day+"日"+hours+"时"+minutes+"分"+"星期"+dayCycle+"</div>");
</script>