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<!DOCTYPE html> <html> <body> <p>更改后单击按钮显示秒数和毫秒数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); d.setUTCSeconds(35, 825); var s = d.getUTCSeconds(); var ms = d.getUTCMilliseconds(); var x = document.getElementById("demo"); x.innerHTML = s + ":" + ms; } </script> </body> </html>