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左移 (<<) - JavaScript | MDN

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左移操作符 (<<) 将第一个操作数向左移动指定位数，左边超出的位数将会被清除，右边将会补零。

const a = 5; // 00000000000000000000000000000101
const b = 2; // 00000000000000000000000000000010

console.log(a << b); // 00000000000000000000000000010100
// Expected output: 20

左移操作符将第一个操作数向左移动指定位数，左边超出的位数将会被清除，右边将会补零。

例如， 9 << 2 得出 36：

     9 (十进制): 00000000000000000000000000001001 (二进制)
                 --------------------------------

9 << 2 (十进制): 00000000000000000000000000100100 (二进制) = 36 (十进制)

移动任意数字 x 至左边 y 位，得出 x * 2 ** y。 所以例如：9 << 3 等价于 9 * 2³ = 9 * 8 = 72。

9 << 3; // 72

// 9 * 2³ = 9 * 8 = 72

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