const a = 500;
const b = 300;
console.log(Number.isInteger(a)); // true
console.log(Number.isInteger(b)); // true
const difference = a - b;
console.log(difference); // NaN
我不明白为什么返回NaN。
不是:
const a = 500;
const b = 300;
console.log(Number.isInteger(a));
console.log(Number.isInteger(b));
const difference = a - b;
console.log(difference);