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<!DOCTYPE html>
<html>
<body>
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<p>单击按钮来显示今天是哪一天。</p>
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<button onclick="myFunction()">试一试</button>
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<p id="demo"></p>
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<script>
function myFunction() {
  var day;
  switch (new Date().getDay()) {
    case 0:
      day = "Sunday";
      break;
    case 1:
      day = "Monday";
      break;
    case 2:
      day = "Tuesday";
      break;
    case 3:
      day = "Wednesday";
      break;
    case 4:
      day = "Thursday";
      break;
    case 5:
      day = "Friday";
      break;
    case  6:
      day = "Saturday";
      break;
  }
  document.getElementById("demo").innerHTML = "Today is " + day;
}
</script>
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</body>
</html>
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