Home
JS
JS
Tryit: JAVASCRIPT
运行 ❯
×
Change Orientation
Change Theme, Dark/Light
<!DOCTYPE html> <html> <body> <p>如果值为整数，Number.isInteger() 函数返回 true。</p> <p>点击按钮检查值是否为整数。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <p><strong>注意：</strong> Number.isInteger() 方法在 IE 11（及更早版本）中不受支持。</p> <script> function myFunction() { var res = ""; res = res + Number.isInteger(123) + ": 123<br>"; res = res + Number.isInteger(-123) + ": -123<br>"; res = res + Number.isInteger(5-2) + ": 5-2<br>"; res = res + Number.isFinite(0) + ": 0<br>"; res = res + Number.isInteger(0.5) + ": 0.5<br>"; res = res + Number.isInteger('123') + ": '123'<br>"; res = res + Number.isInteger(false) + ": false<br>"; res = res + Number.isInteger(Infinity) + ": Infinity<br>"; res = res + Number.isInteger(-Infinity) + ": -Infinity<br>"; res = res + Number.isInteger(0 / 0) + ": 0 / 0<br>"; document.getElementById("demo").innerHTML = res; } </script> </body> </html>