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

语法

wm.set(key, value);

参数

key
必须的。是要在WeakMap 对象中添加/更新元素的key部分。
value
必须的。是要在WeakMap 对象中添加/更新元素的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 Latest Draft (ECMA-262)
WeakMap.prototype.set
Draft  

浏览器兼容

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 36 6.0 (6.0) 11 23 7.1
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 未实现 6.0 (6.0) 未实现 未实现 8

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

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