Bitwise OR assignment (|=) - JavaScript 编辑

The bitwise OR assignment operator (|=) uses the binary representation of both operands, does a bitwise OR operation on them and assigns the result to the variable.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

Operator: x |= y
Meaning:  x = x | y

Examples

Using bitwise OR assignment

let a = 5;
a |= 2; // 7
// 5: 00000000000000000000000000000101
// 2: 00000000000000000000000000000010
// -----------------------------------
// 7: 00000000000000000000000000000111

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'Assignment operators' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• Assignment operators in the JS guide
• Bitwise OR operator
• Logical OR assignment (||=)