如何在 JavaScript 中检查一个值是否为整数
要检查值是否为整数，请调用 Number.isInteger() 方法，将值作为参数传递给它。 如果提供的值是整数，则该方法返回 true，否则返回 false。
console.log(Number.isInteger(1)); // 👉️ true
console.log(Number.isInteger(1.5)); // 👉️ false
console.log(Number.isInteger('1')); // 👉️ false
console.log(Number.isInteger(-10)); // 👉️ true
Number.isInteger方法采用的唯一参数是我们要测试的整数值。
如果传入值，该方法返回 true：
- 是一个整数
- 是一个可以表示为整数的浮点数
以下是可以表示为整数的浮点数示例：
const a = 10.0;
const b = 10.000000000000000123;
console.log(Number.isInteger(a)); // 👉️ true
console.log(Number.isInteger(b)); // 👉️ true
如果使用 NaN 或 Infinity 调用 Number.isInteger 方法，则返回 false。
console.log(Number.isInteger(NaN)); // 👉️ false
console.log(Number.isInteger(Infinity)); // 👉️ false
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