Home
JS
JS
Tryit: JAVASCRIPT
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <body> <p>如果值是有限的合法数字，Number.isFinite() 函数返回 true。</p> <p>点击按钮检查数值是否为有限数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <p><strong>注意：</strong> Number.isFinite() 函数在 IE 11（及更早版本）中不受支持。</p> <script> function myFunction() { var res = ""; res = res + Number.isFinite(123) + ": 123<br>"; res = res + Number.isFinite(-1.23) + ": -1.23<br>"; res = res + Number.isFinite(5-2) + ": 5-2<br>"; res = res + Number.isFinite(0) + ": 0<br>"; res = res + Number.isFinite('123') + ": '123'<br>"; res = res + Number.isFinite('Hello') + ": 'Hello'<br>"; res = res + Number.isFinite('2005/12/12') + ": '2005/12/12'<br>"; res = res + Number.isFinite(Infinity) + ": Infinity<br>"; res = res + Number.isFinite(-Infinity) + ": -Infinity<br>"; res = res + Number.isFinite(0 / 0) + ": 0 / 0<br>"; document.getElementById("demo").innerHTML = res; } </script> </body> </html>