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• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

handler.deleteProperty() method is a trap for the delete operator.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

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

参数

The following parameters are passed to the deleteProperty() 方法。 this is bound to the handler.

target

The target object.

property

The name or Symbol of the property to delete.

返回值

deleteProperty() method must return a 布尔 indicating whether or not the property has been successfully deleted.

描述

handler.deleteProperty() method is a trap for the delete operator.

Interceptions

This trap can intercept these operations:

• Property deletion: delete proxy [ foo ] and delete proxy . foo
• Reflect.deleteProperty()

Invariants

If the following invariants are violated, the proxy will throw a TypeError :

• A property cannot be deleted, if it exists as a non-configurable own property of the target object.

范例

Trapping the delete operator

The following code traps the delete operator.

const p = new Proxy({}, {
  deleteProperty: function(target, prop) {
    if (prop in target){
      delete target[prop]
      console.log('property removed: ' + prop)
      return true
    }
    else {
      console.log('property not found: ' + prop)
      return false
    }
  }
})
let result
p.a = 10
console.log('a' in p)  // true
result = delete p.a    // "property removed: a"
console.log(result)    // true
console.log('a' in p)  // false
result = delete p.a    // "property not found: a"
console.log(result)    // false
					

规范

规范
ECMAScript (ECMA-262) The definition of '[[Delete]]' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
deleteProperty	Chrome 49	Edge 12	Firefox 18	IE No	Opera 36	Safari 10	WebView Android 49	Chrome Android 49	Firefox Android 18	Opera Android 36	Safari iOS 10	Samsung Internet Android 5.0	nodejs 6.0.0

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Proxy
• handler
• delete operator
• Reflect.deleteProperty()

元数据

• 最后修改： May 25, 2020

相关话题

1. 标准内置对象
2. Proxy/handler