WeakRef.prototype.deref()

¥Syntax

deref()

¥Parameters

没有任何。

¥None.

¥Return value

WeakRef 的目标值，可以是对象，也可以是 未注册符号。如果该值已被垃圾回收，则返回 undefined。

¥The target value of the WeakRef, which is either an object or a non-registered symbol. Returns undefined if the value has been garbage-collected.

¥Description

请参阅 WeakRef 页的 关于 WeakRef 的注释 部分了解一些重要说明。

¥See the Notes on WeakRefs section of the WeakRef page for some important notes.

¥Examples

¥Using deref()

有关完整示例，请参阅 WeakRef 页的 示例 部分。

¥See the Examples section of the WeakRef page for the complete example.

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;
  }
};

¥See also

• WeakRef