JavaScript使用Date对象实时显示系统时间的实现方法

完整代码示例

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>www.jb51.net 获取系统时间</title>
    <script language="JavaScript">
      function realSysTime(clock) {
        var now = new Date();
        var year = now.getFullYear(); //获取年份
        var month = now.getMonth(); //获取月份
        var date = now.getDate(); //获取日期
        var day = now.getDay(); //获取星期
        var hour = now.getHours(); //获取小时
        var minute = now.getMinutes(); //获取分钟
        var seconds = now.getSeconds(); //获取秒
        month = month + 1;
        var arr_week = new Array("星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六");
        var week = arr_week[day];
        var time = year + "年" + month + "月" + date + "日 " + week + " " + hour + ":" + minute + ":" + seconds;
        clock.innerHTML = "当前时间：" + time;
      }
      function show() {
        window.setInterval("realSysTime(clock)", 1000);
      }
    </script>
  </head>
    <body>
        <div id='clock'></div>
        <script> 
        window.onload=show()
        </script>
    </body>
</html>