handler.deleteProperty()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
handler.deleteProperty() 方法用于拦截对对象属性的 delete 操作。
语法
js
var p = new Proxy(target, {
deleteProperty: function (target, property) {},
});
参数
返回值
deleteProperty 必须返回一个 Boolean 类型的值，表示了该属性是否被成功删除。
描述
handler.deleteProperty() 方法可以拦截 delete 操作。
拦截
该方法会拦截以下操作：
- 删除属性：
delete proxy[foo]和delete proxy.foo Reflect.deleteProperty()
不变量
如果违背了以下不变量，proxy 将会抛出一个 TypeError:
- 如果目标对象的属性是不可配置的，那么该属性不能被删除。
示例
以下代码演示了对 delete 操作的拦截。
js
var p = new Proxy(
{},
{
deleteProperty: function (target, prop) {
console.log("called: " + prop);
return true;
},
},
);
delete p.a; // "called: a"
规范
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-proxy-object-internal-methods-and-internal-slots-delete-p |