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<!DOCTYPE html> <html> <body> <p>单击该按钮可根据 UTC 显示星期几。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); var n = d.getUTCDay(); document.getElementById("demo").innerHTML = n; } </script> <p><strong>Note:</strong> 0=Sunday, 1=Monday, etc.</p> </body> </html>