WeakMap.prototype.set() - JavaScript 编辑

set() 方法根据指定的key和value在 WeakMap对象中添加新/更新元素。

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语法

wm.set(key, value);

参数

key

必须的。必须是对象。是要在WeakMap 对象中添加元素的key部分。

value

必须的。任意的值。是要在WeakMap 对象中添加/元素的value部分。

返回值

该WeakMap对象

例子

使用set方法

var wm = new WeakMap();
var obj = {};

// Add new elements to the WeakMap
wm.set(obj, "foo").set(window, "bar"); // chainable

// Update an element in the WeakMap
wm.set(obj, "baz");

规范

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262) WeakMap.prototype.set	Standard	Initial definition.
ECMAScript (ECMA-262) WeakMap.prototype.set	Living Standard

浏览器兼容

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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.

Firefox-特殊说明

• 直到Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30), WeakMap.prototype.set returned undefined 而不支持联式。它已经修复 (bug 1031632). 这样的实现也存在于 Chrome/v8 (issue).

See also

• WeakMap
• WeakMap.prototype.get()
• WeakMap.prototype.has()