å·¦ã·ããä»£å¥æ¼ç®å (<<=)

Baseline Widely available

This feature is well established and works across many devices and browser versions. Itâs been available across browsers since 2015å¹´7æ.

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let a = 5; // 00000000000000000000000000000101

a <<= 2; // 00000000000000000000000000010100

console.log(a);
// äºæ³ãããçµæ: 20

x <<= y

x <<= y ã¯ x = x << y ã¨åçã§ãããå¼ x ãä¸åº¦ã ãè©ä¾¡ãããç¹ãç°ãªãã¾ãã

let a = 5;
// 00000000000000000000000000000101

a <<= 2; // 20
// 00000000000000000000000000010100

let b = 5n;
b <<= 2n; // 20n

Specification
ECMAScriptÂ® 2027 LanguageÂ Specification # sec-assignment-operators

This page was last modified on 2025å¹´9æ8æ¥ by MDN contributors.