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<!DOCTYPE html> <html> <body> <h2>JavaScript 数字方法</h2> <p>如果参数是 Infinity 或 NaN，isFinite() 方法返回 false。</p> <p>否则返回 true。</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = isFinite(10 / 0) + "<br>" + isFinite(10 / 1); </script> </body> </html>