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WeakMap的弱引用键的描述容易有歧义

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap an object's presence as a `key` in a WeakMap does not prevent the object from being garbage collected. Once an object used as a key has been collected, its corresponding values in any WeakMap become candidates for garbage collection as well

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Original file line number	Diff line number	Diff line change
`@@ -217,7 +217,7 @@ map.forEach((value, key) => { console.log(key, value)})`
`217`	`217`
`218`	`218`	与`Map`的区别
`219`	`219`	`- Map 的键可以是任意类型,WeakMap 的键只能是对象类型`
`220`		`-- WeakMap 键名所指向的对象,不计入垃圾回收机制`
	`220`	`+- WeakMap 的键对象,不计入垃圾回收机制`
`221`	`221`
`222`	`222`	`WeakMap` 的属性跟操作方法与 `Map` 一致,同 `WeakSet` 一样,因为是弱引用,所以 `WeakSet` 也没有遍历方法
`223`	`223`

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