WeakMap.prototype.set() - JavaScript 编辑

The set() method adds a new element with a specified key and value to a WeakMap object.

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.

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

wm.set(key, value);

Parameters

key

Required. Must be object. The key of the element to add to the WeakMap object.

value

Required. Any value. The value of the element to add to the WeakMap object.

Return value

The WeakMap object.

Examples

Using the set() method

var wm = new WeakMap();
var obj = {};

// Add new elements to the WeakMap
wm.set(obj, 'foo').set(window, 'bar'); // chainable

// Update an element in the WeakMap
wm.set(obj, 'baz');

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'WeakMap.prototype.set' in that specification.

Browser compatibility

BCD tables only load in the browser

See also

• WeakMap
• WeakMap.prototype.get()
• WeakMap.prototype.has()