W3School TIY
编辑您的代码：
<html> <body> <p>点击下面的按钮，会显示出基于今日日期的消息：</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction() { var x; var d=new Date().getDay(); switch (d) { case 6: x="Today it's Saturday"; break; case 0: x="Today it's Sunday"; break; default: x="Looking forward to the Weekend"; } document.getElementById("demo").innerHTML=x; } </script> </body> </html>
查看结果: