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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number/valueOf below:

Number.prototype.valueOf() - JavaScript | MDN

Baseline Widely available

Number 值的 valueOf() 方法返回该数字的值。

const numObj = new Number(42);
console.log(typeof numObj);
// Expected output: "object"

const num = numObj.valueOf();
console.log(num);
// Expected output: 42

console.log(typeof num);
// Expected output: "number"

无。

一个表示指定 Number 对象的原始值的数字。

该方法通常由 JavaScript 在内部调用，而非在 Web 代码中显式调用。

const numObj = new Number(10);
console.log(typeof numObj); // object

const num = numObj.valueOf();
console.log(num); // 10
console.log(typeof num); // number

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