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 2021年4月.
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
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® 2026 Language Specification # sec-weak-ref.prototype.deref |
浏览器兼容性
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