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<!DOCTYPE html> <html> <body> <h2>JavaScript Math 对象</h2> <p>Math.PI 返回 PI：</p> <p id="piDemo"></p> <p>Math.sqrt(16) 返回 16 的平方根：</p> <p id="sqrtDemo"></p> <script> var x = Math.PI; var y = Math.sqrt(16); document.getElementById("piDemo").innerHTML = x; document.getElementById("sqrtDemo").innerHTML = y; </script> </body> </html>