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<!DOCTYPE html> <html> <body> <h2>JavaScript Math</h2> <p>Math.floor(Math.random() * 10) 返回一个介于 0 和 9 之间的随机整数（均包含在内）：</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Math.floor(Math.random() * 10); </script> </body> </html>