handler.apply()
The handler.apply()
method is a trap for a function call.
Syntax
JavaScript
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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
There are no invariants for the handler.apply
method.
Examples
The following code traps a function call.
JavaScript
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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 2017 Draft (ECMA-262) The definition of '[[Call]]' in that specification. |
Draft |
Browser compatibility
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) | ? | ? | ? |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/javascript/reference/global_objects/proxy/handler/apply