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

WeakRef.prototype.deref() - JavaScript | MDN

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deref方法返回WeakRef 实例的目标对象，如果目标对象已被垃圾收集，则返回undefined 。

返回 WeakRef 的目标对象，如果该对象已被垃圾收集，则返回undefined 。

有关一些重要说明，请参阅WeakRef页面上的Notes on WeakRefs 。

有关完整示例，请参阅WeakRef页面的示例部分。

const tick = () => {
  // Get the element from the weak reference, if it still exists
  const element = this.ref.deref();
  if (element) {
    element.textContent = ++this.count;
  } else {
    // The element doesn't exist anymore
    console.log("The element is gone.");
    this.stop();
    this.ref = null;
  }
};

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