get()
方法返回某个 Map
对象中的一个指定元素。
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语法
myMap.get(key);
参数
- key
-
必须参数,也是它唯一的参数,要从目标
Map
对象中获取的元素的键。
返回值
返回一个 Map
对象中与指定键相关联的值,如果找不到这个键则返回 undefined
。
示例
使用 get
方法
var myMap = new Map(); myMap.set("bar", "foo"); myMap.get("bar"); // 返回 "foo" myMap.get("baz"); // 返回 undefined
规范
规范 | 状态 | 备注 |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) Map.prototype.get |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) Map.prototype.get |
Draft |
浏览器兼容性
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.
Update compatibility data on GitHub
Desktop | Mobile | Server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
get |
Chrome Full support 38 | Edge Full support 12 | Firefox Full support 13 | IE Full support 11 | Opera Full support 25 | Safari Full support 8 | WebView Android Full support 38 | Chrome Android Full support 38 | Firefox Android Full support 14 | Opera Android Full support 25 | Safari iOS Full support 8 | Samsung Internet Android Full support 3.0 | nodejs Full support Yes |
Legend
- Full support
- Full support