`handler.deleteProperty()` 方法用于拦截对对象属性的 `delete` 操作。

## 语法

    var p = new Proxy(target, {
      deleteProperty: function(target, property) {
      }
    });

### 参数

`deleteProperty` 方法将会接受以下参数。 `this` 被绑定在 handler上。

`target`
  目标对象。
`property`
  待删除的属性名。

### 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。

    var p = new Proxy({}, {
      deleteProperty: function(target, prop) {
        console.log('called: ' + prop);
        return true;
      }
    });

    delete p.a; // "called: a"

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 2015 (6th Edition, ECMA-262) [[Delete]] | Standard | Initial definition.
ECMAScript Latest Draft (ECMA-262) [[Delete]] | Draft |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | ? | 18 (18) | ? | ? | ?

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | ? | ? | 18.0 (18) | ? | ? | ?

## 另见

- `Proxy`
- `handler`
- `delete` 操作符
- `Reflect.deleteProperty()`