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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/WeakRef/WeakRef below:

WeakRef() æž„é€ å‡½æ•° - JavaScript

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WeakRef() 会创建一个 WeakRef 对象，它是对于目标对象的弱引用。

new WeakRef(targetObject)

备注： WeakRef() 必须通过 new 关键字调用。试图在没有 new 的情况下调用会抛出一个 TypeError。

targetObject

WeakRef 要指向的目标对象 (也称作 referent）。

完整的示例请见 WeakRef 主页面。

class Counter {
  constructor(element) {
    // 创建一个对 DOM 元素的弱引用
    this.ref = new WeakRef(element);
    this.start();
  }
}

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