乘法（*）

¥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 乘法；否则，它执行数字乘法。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 multiplication if both operands become BigInts; otherwise, it performs number multiplication. A TypeError is thrown if one operand becomes a BigInt but the other becomes a number.

¥Examples

¥Multiplication using numbers

2 * 2; // 4
-2 * 2; // -4

¥Multiplication with Infinity

Infinity * 0; // NaN
Infinity * Infinity; // Infinity

¥Multiplication with non-numbers

"foo" * 2; // NaN
"2" * 2; // 4

¥Multiplication using BigInts

2n * 2n; // 4n
-2n * 2n; // -4n

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

// To multiply a BigInt with a non-BigInt, convert either operand
2n * BigInt(2); // 4n
Number(2n) * 2; // 4

¥See also

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