Set.prototype.clear() - JavaScript 编辑

The clear() method removes all elements from a Set object.

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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

mySet.clear();

Return value

undefined.

Examples

Using the clear() method

var mySet = new Set();
mySet.add(1);
mySet.add('foo');

mySet.size;       // 2
mySet.has('foo'); // true

mySet.clear();

mySet.size;       // 0
mySet.has('bar')  // false

Specifications

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

Browser compatibility

BCD tables only load in the browser

See also

• Set
• Set.prototype.delete()