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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数字</h1>
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<h2>Number.isInteger() 方法</h2>
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<p>如果值是数据类型 Number 的整数，则 Number.isInteger() 返回 true：</p>
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<p id="demo"></p>
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<p>Internet Explorer 11（或更早版本）不支持 Number.isInteger()。</p>
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<script>
let result =
"Is 4-2 an integer? " + Number.isInteger(4-2) + "<br>" +
"Is 4/2 an integer? " + Number.isInteger(4/2) + "<br>" +
"Is 5-2 an integer? " + Number.isInteger(5-2) + "<br>" +
"Is 5/2 an integer? " + Number.isInteger(5/2);
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document.getElementById("demo").innerHTML = result;
</script>
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</body>
</html>
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