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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

Proxy.revocable() method is used to create a revocable Proxy 对象。

句法

Proxy.revocable(target, handler);
					

参数

target

A target object to wrap with Proxy . It can be any sort of object, including a native array, a function, or even another proxy.

handler

An object whose properties are functions define the behavior of proxy p when an operation is performed on it.

返回值

A newly created revocable Proxy object is returned.

描述

A revocable Proxy is an object with following two properties {proxy: proxy, revoke: revoke} .

proxy

A Proxy object created with new Proxy(target, handler) 调用。

revoke

A function with no argument to invalidate (switch off) the proxy .

若 revoke() function gets called, the proxy becomes unusable: Any trap to a handler will throw a TypeError . Once a proxy is revoked, it will remain revoked and can be garbage collected. Calling revoke() again has no effect.

范例

Using Proxy.revocable

var revocable = Proxy.revocable({}, {
  get: function(target, name) {
    return "[[" + name + "]]";
  }
});
var proxy = revocable.proxy;
console.log(proxy.foo); // "[[foo]]"
revocable.revoke();
console.log(proxy.foo); // TypeError is thrown
proxy.foo = 1           // TypeError again
delete proxy.foo;       // still TypeError
typeof proxy            // "object", typeof doesn't trigger any trap
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Proxy Revocation Functions' 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
revocable	Chrome 63	Edge 12	Firefox 34	IE No	Opera 50	Safari 10	WebView Android 63	Chrome Android 63	Firefox Android 34	Opera Android 46	Safari iOS 10	Samsung Internet Android 8.0	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

元数据

• 最后修改： May 7, 2020

相关话题

1. 标准内置对象
2. Proxy/handler