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 using numbers

5 - 3; // 2
3 - 5; // -2

其他非 BigInt 值被强制转换为数字：

¥Other non-BigInt values are coerced to numbers:

"foo" - 3; // NaN; "foo" is converted to the number NaN
5 - "3"; // 2; "3" is converted to the number 3

¥Subtraction using BigInts

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

要使用 BigInt 和非 BigInt 进行减法，请转换任一操作数：

¥To do subtraction with a BigInt and a non-BigInt, convert either operand:

2n - BigInt(1); // 1n
Number(2n) - 1; // 1

¥See also

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