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<!DOCTYPE html> <html> <body> <p>单击该按钮可显示从特定日期开始的月中第几天。</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"); var n = d.getDate() document.getElementById("demo").innerHTML = n; } </script> </body> </html>