W3School TIY Editor
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<!DOCTYPE html> <html> <body> <p>单击该按钮来显示今天是哪一天。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <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; default: day = "Unknown Day"; } document.getElementById("demo").innerHTML = "Today is " + day; } </script> </body> </html>