WeakMap.prototype.delete() - JavaScript 编辑

The delete() method removes the specified element from 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.delete(key);

Parameters

key

The key of the element to remove from the WeakMap object.

Return value

true if an element in the WeakMap object has been removed successfully. false if the key is not found in the WeakMap or if the key is not an object.

Examples

Using the delete() method

var wm = new WeakMap();
wm.set(window, 'foo');

wm.delete(window); // Returns true. Successfully removed.

wm.has(window);    // Returns false. The window object is no longer in the WeakMap.

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also

• WeakMap