代码示例:(标识:eg_js_switch_1)
<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
var day;
switch (new Date().getDay()) {
  case 0:
    day = "周日";
    break;
  case 1:
    day = "周一";
    break;
  case 2:
    day = "周二";
    break;
  case 3:
    day = "周三";
    break;
  case 4:
    day = "周四";
    break;
  case 5:
    day = "周五";
    break;
  case  6:
    day = "周六";
}
document.getElementById("demo").innerHTML = "今天是" + day;
</script>

</body>
</html>
运行结果: