减法（-）

¥Syntax

x - y

¥Description

- 运算符针对两种类型的操作数进行重载：编号和 BigInt。它首先 将两个操作数强制转换为数值 并测试它们的类型。如果两个操作数都变成 BigInt，则执行 BigInt 减法；否则，执行数字减法。如果一个操作数变为 BigInt 而另一个操作数变为数字，则抛出 TypeError。

¥The - operator is overloaded for two types of operands: number and BigInt. It first coerces both operands to numeric values and tests the types of them. It performs BigInt subtraction if both operands become BigInts; otherwise, it performs number subtraction. A TypeError is thrown if one operand becomes a BigInt but the other becomes a number.

¥Examples

¥Subtraction with numbers

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

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

¥Subtraction with non-numbers

// 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

¥Subtraction with BigInts

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

不能在减法中混合使用 BigInt 和数字操作数。

¥You cannot mix BigInt and number operands in subtraction.

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

¥See also

• 添加 (+)
• 师（/）
• 乘法（*）
• 余数 (%)
• 求幂 (**)
• 增量 (++)
• 递减 (--)
• 一元否定 (-)
• 一元加 (+)