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<!DOCTYPE html> <html> <body> <h1>JavaScript 数字</h1> <h2>Number.isInteger() 方法</h2> <p>如果值是数据类型 Number 的整数，则 Number.isInteger() 返回 true：</p> <p id="demo"></p> <p>Internet Explorer 11（或更早版本）不支持 Number.isInteger()。</p> <script> let result = "Is 0 an integer? " + Number.isInteger(0) + "<br>" + "Is 0/0 an integer? " + Number.isInteger(0/0) + "<br>" + "Is 0.5 an integer? " + Number.isInteger(0.5) + "<br>" + "Is false an integer? " + Number.isInteger(false) + "<br>" + "Is Infinity an integer? " + Number.isInteger(Infinity) + "<br>" + "Is -Infinityo an integer? " + Number.isInteger(-Infinity) + "<br>" + "Is NaN an integer? " + Number.isInteger(NaN); document.getElementById("demo").innerHTML = result; </script> </body> </html>