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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Operators/Subtraction below:

减法（-） - JavaScript | MDN

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减法（-）运算符将两个操作数相减，并产生两者之差。

console.log(5 - 3);
// Expected output: 2

console.log(3.5 - 5);
// Expected output: -1.5

console.log(5 - "hello");
// Expected output: NaN

console.log(5 - true);
// Expected output: 4

减法运算符将两个操作数转换为数值，并根据两个操作数的类型执行数字减法或 BigInt 减法。如果类型不匹配，则抛出 TypeError。

// Number - Number -> subtraction
5 - 3; // 2

// Number - Number -> subtraction
3 - 5; // -2

// String - Number -> subtraction
"foo" - 3; // NaN; "foo" is converted to the number NaN

// Number - String -> subtraction
5 - "3"; // 2; "3" is converted to the number 3

// BigInt - BigInt -> subtraction
2n - 1n; // 1n

你不能在减法中混合使用 BigInt 和数字操作数。

2n - 1; // TypeError: Cannot mix BigInt and other types, use explicit conversions
2 - 1n; // TypeError: Cannot mix BigInt and other types, use explicit conversions

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