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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字</h2> <p>您可以使用全局 JavaScript 函数 isNaN() 来确定值是否为数字：</p> <p id="demo"></p> <script> var x = 100 / "Apple"; document.getElementById("demo").innerHTML = isNaN(x); </script> </body> </html>