WeakRef.prototype.deref()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2021.

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

语法

obj = ref.deref();

返回值

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

说明

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

示例

使用 deref

有关完整示例,请参阅WeakRef页面的示例部分。

js
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;
  }
};

规范

Specification
ECMAScript® 2025 Language Specification
# sec-weak-ref.prototype.deref

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
deref

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见