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赋值（=） - JavaScript | MDN

Baseline Widely available

简单赋值运算符（=）用于给变量赋值。赋值表达式本身的值为要赋值的值。为了将一个值赋给多个变量，可以链式使用赋值运算符。

let x = 2;
const y = 3;

console.log(x);
// Expected output: 2

console.log((x = y + 1)); // 3 + 1
// Expected output: 4

console.log((x = x * y)); // 4 * 3
// Expected output: 12

// 假设已经存在以下变量
//  x = 5
//  y = 10
//  z = 25

x = y; // x 为 10
x = y = z; // x, y 都为 25

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