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Map.prototype.delete()

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 delete()删除Map实例key指定的值。

Syntax 语法

myMap.delete(key);

Parameters 参数

key
Required. The key of the element to remove from the Map object.

Return value

Returns true if an element in the Map object existed and has been removed, or false if the element does not exist.

Examples

Using the delete method

var myMap = new Map();
myMap.set("bar", "foo");

myMap.delete("bar"); // Returns true. Successfully removed.
myMap.has("bar");    // Returns false. The "bar" element is no longer present.

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
Map.prototype.delete
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
Map.prototype.delete
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 38 13.0 (13.0) 11 25 7.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 未实现 38 13.0 (13.0) 未实现 未实现 8

See also

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