The handler.apply()
method is a trap for a function call.
Syntax
var p = new Proxy(target, { apply: function(target, thisArg, argumentsList) { } });
Parameters
The following parameters are passed to the apply
method. this
is bound to the handler.
target
- The target object.
thisArg
- The this argument for the call.
argumentsList
- The list of arguments for the call.
Return value
The apply
method can return any value.
Description
The handler.apply
method is a trap for a function call.
Interceptions
This trap can intercept these operations:
proxy(...args)
Function.prototype.apply()
andFunction.prototype.call()
Reflect.apply()
Invariants
If the following invariants are violated, the proxy will throw a TypeError:
The target
must be a callable itself. That is, it must be a function object.
Examples
The following code traps a function call.
var p = new Proxy(function() {}, { apply: function(target, thisArg, argumentsList) { console.log('called: ' + argumentsList.join(', ')); return argumentsList[0] + argumentsList[1] + argumentsList[2]; } }); console.log(p(1, 2, 3)); // "called: 1, 2, 3" // 6
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of '[[Call]]' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of '[[Call]]' in that specification. |
Living Standard |
Browser compatibility
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.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 49 | 12 | 18 | No | 36 | 10 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 49 | 49 | Yes | 18 | No | 36 | 10 |