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<!DOCTYPE html> <html> <body> <p>设置毫秒后，点击按钮显示日期时间的毫秒数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); d.setMilliseconds(192); var n = d.getMilliseconds(); document.getElementById("demo").innerHTML = n; } </script> </body> </html>