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<!DOCTYPE html> <html> <body> <p>单击该按钮可在更改年月日后显示日期。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var d = new Date(); d.setUTCFullYear(2020, 10, 3); document.getElementById("demo").innerHTML = d; } </script> </body> </html>