Weak Set 

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  <script>
    let set = new WeakSet()
    let key = {}

    set.add(key)
    console.log(set.has(key))  //true

    key = { a: 1 }   //移除了key的第一个引用，添加了新的引用
    console.log(set.has(key))  //false， Weak Set中的引用也自动移除
  </script>
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posted @ 2021-04-21 11:05  徐同保  阅读(24)  评论(0)  编辑  收藏  举报