delete()
方法用于移除 Map
对象中指定的元素。
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.
语法
myMap.delete(key);
参数
- key
- 必须。从
Map
对象中移除的元素的键。
返回值
- Boolean
- 如果
Map
对象中存在该元素,则移除它并返回true
;否则如果该元素不存在则返回false
。
示例
使用 delete 方法
var myMap = new Map();
myMap.set("bar", "foo");
myMap.delete("bar"); // 返回 true。成功地移除元素
myMap.has("bar"); // 返回 false。"bar" 元素将不再存在于 Map 实例中
规范
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) Map.prototype.delete |
Standard | Initial definition. |
ECMAScript (ECMA-262) Map.prototype.delete |
Living Standard |
浏览器兼容性
BCD tables only load in the browser
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.