求幂赋值 (**=)

求幂赋值 (**=) 运算符对两个操作数执行 exponentiation 并将结果赋给左侧操作数。

¥The exponentiation assignment (**=) operator performs exponentiation on the two operands and assigns the result to the left operand.

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¥Syntax

x **= y

¥Description

x **= y 与 x = x ** y 等效，只是表达式 x 仅计算一次。

¥x **= y is equivalent to x = x ** y, except that the expression x is only evaluated once.

¥Examples

¥Using exponentiation assignment

let bar = 5;

bar **= 2; // 25
bar **= "foo"; // NaN

let foo = 3n;
foo **= 2n; // 9n

Specification
ECMAScript Language Specification # sec-assignment-operators

¥Specifications

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¥See also