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<!DOCTYPE html> <html> <body> <p>根据 UTC，单击该按钮可显示特定日期时间的毫秒数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var d = new Date("July 21, 1983 01:15:00:195"); var n = d.getUTCMilliseconds(); document.getElementById("demo").innerHTML = n; } </script> </body> </html>