WeakRef() 构造函数

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.

* Some parts of this feature may have varying levels of support.

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

语法

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。

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();
  }
}

Specification
ECMAScript® 2026 Language Specification # sec-weak-ref-constructor