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<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>Number.isFinite() 函数检测的值如果是有限数字返回 true，否则返回 false。</p> <p>点击按钮查看测试结果。</p> <button onclick="myFunction()">点我</button> <p id="demo"></p> <p><strong>注意:</strong> IE 11 及更早 IE 版本不支持 Number.isFinite()函数。</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>
运行结果：
