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The proxy's handler object is a placeholder object which contains traps for proxies.
Methods
All traps are optional. If a trap has not been defined, the default behavior is to forward the operation to the target.
handler.getPrototypeOf()- A trap for
Object.getPrototypeOf. handler.setPrototypeOf()- A trap for
Object.setPrototypeOf. handler.isExtensible()- A trap for
Object.isExtensible. handler.preventExtensions()- A trap for
Object.preventExtensions. handler.getOwnPropertyDescriptor()- A trap for
Object.getOwnPropertyDescriptor. handler.defineProperty()- A trap for
Object.defineProperty. handler.has()- A trap for the
inoperator. handler.get()- A trap for getting property values.
handler.set()- A trap for setting property values.
handler.deleteProperty()- A trap for the
deleteoperator. handler.ownKeys()- A trap for
Object.getOwnPropertyNamesandObject.getOwnPropertySymbols. handler.apply()- A trap for a function call.
handler.construct()- A trap for the
newoperator.
Some non-standard traps are obsolete and have been removed.
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) La definición de 'Proxy Object Internal Methods and Internal Slots' en esta especificación. |
Standard | Initial definition. |
| ECMAScript Latest Draft (ECMA-262) La definición de 'Proxy Object Internal Methods and Internal Slots' en esta especificación. |
Draft | The enumerate handler has been removed. |
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 |
|---|---|---|---|---|---|---|
apply | 49 | 12 | 18 | No | 36 | 10 |
construct | 49 | 12 | 18 | No | 36 | 10 |
defineProperty | 49 | 12 | 18 | No | 36 | 10 |
deleteProperty | 49 | 12 | 18 | No | 36 | 10 |
enumerate | No | No | 37 — 47 | No | No | No |
get | 49 | 12 | 18 | No | 36 | 10 |
getOwnPropertyDescriptor | 49 | 12 | 18 | No | 36 | 10 |
getPrototypeOf | No | No | 49 | No | No | No |
has | 49 | 12 | 18 | No | 36 | 10 |
isExtensible | ? | ? | 31 | No | ? | ? |
ownKeys | 49 | 12 | 181 | No | 36 | 10 |
preventExtensions | 49 | 12 | 22 | No | 36 | 10 |
set | 49 | 12 | 18 | No | 36 | 10 |
setPrototypeOf | ? | ? | 49 | No | ? | ? |
| Feature | Android webview | Chrome para Android | Edge mobile | Firefox para Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
apply | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
construct | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
defineProperty | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
deleteProperty | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
enumerate | No | No | No | 37 — 47 | No | No | No |
get | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
getOwnPropertyDescriptor | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
getPrototypeOf | No | No | No | 49 | No | No | No |
has | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
isExtensible | ? | ? | ? | 31 | ? | ? | ? |
ownKeys | 49 | 49 | Si | 181 | 36 | 10 | 5.0 |
preventExtensions | 49 | 49 | Si | 22 | 36 | 10 | 5.0 |
set | 49 | 49 | Si | 18 | 36 | 10 | 5.0 |
setPrototypeOf | ? | ? | ? | 49 | ? | ? | ? |
1. In Firefox 42, the implementation got updated to reflect the final ES2015 specification: The result is now checked if it is an array and if the array elements are either of type string or of type symbol. Enumerating duplicate own property names is not a failure anymore.