按位与赋值(&=)

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按位与赋值运算符(&=)表示两个操作数的二进制,对它们进行按位AND运算并将结果分配给变量。

语法

Operator: x &= y
Meaning:  x  = x & y

例子

按位与赋值运算

let a = 5;
// 5:     00000000000000000000000000000101
// 2:     00000000000000000000000000000010
a &= 2; // 0

规范

Specification
ECMAScript (ECMA-262)
Assignment operators

浏览器兼容性

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
Bitwise AND assignment (x &= y)Chrome Full support 1Edge Full support 12Firefox Full support 1IE Full support 3Opera Full support 3Safari Full support 1WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 1Samsung Internet Android Full support 1.0nodejs Full support 0.1.100

Legend

Full support  
Full support

参见