`SharedArrayBuffer.prototype` 属性表示 `SharedArrayBuffer` 对象的原型。

`SharedArrayBuffer.prototype` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## Description

`SharedArrayBuffer` instances inherit from `SharedArrayBuffer.prototype`. As with all constructors, you can change the constructor's prototype object to make changes to all `SharedArrayBuffer` instances.

## Properties

SharedArrayBuffer.prototype.constructor
  Specifies the function that creates an object's prototype. The initial value is the standard built-in `SharedArrayBuffer` constructor.
`SharedArrayBuffer.prototype.byteLength` 只读
  The size, in bytes, of the array. This is established when the array is constructed and cannot be changed. Read only.

## Methods

`SharedArrayBuffer.prototype.slice(begin, end)`
  Returns a new `SharedArrayBuffer` whose contents are a copy of this `SharedArrayBuffer`'s bytes from `begin`, inclusive, up to `end`, exclusive. If either `begin` or `end` is negative, it refers to an index from the end of the array, as opposed to from the beginning.

## Specifications

Specification | Status | Comment
--- | --- | ---
ECMAScript Latest Draft (ECMA-262) SharedArrayBuffer.prototype | Draft | Initial definition in ES2017.

## 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.

Update compatibility data on GitHub

| Desktop | Mobile | Server
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet | Node.js
`prototype` | Chrome Full support 68 Full support 68 No support 60 — 63 Notes Notes Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks. This was a temporary removal while mitigations were put in place. | Edge No support 16 — 17 Notes No support 16 — 17 Notes Notes Support was removed to mitigate speculative execution side-channel attacks (Windows blog). | Firefox Full support 57 Notes Disabled Full support 57 Notes Disabled Notes Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog). Disabled From version 57: this feature is behind the `javascript.options.shared_memory` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config. No support 55 — 57 No support 46 — 55 Disabled Disabled From version 46 until version 55 (exclusive): this feature is behind the `javascript.options.shared_memory` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config. | IE No support No | Opera No support No | Safari No support 10.1 — ? | WebView Android No support 60 — 63 Notes No support 60 — 63 Notes Notes Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place. | Chrome Android No support 60 — 63 Notes No support 60 — 63 Notes Notes Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks. This is intended as a temporary measure until other mitigations are in place. | Edge Mobile ? | Firefox Android Full support 57 Notes Disabled Full support 57 Notes Disabled Notes Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog). Disabled From version 57: this feature is behind the `javascript.options.shared_memory` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config. No support 55 — 57 No support 46 — 55 Disabled Disabled From version 46 until version 55 (exclusive): this feature is behind the `javascript.options.shared_memory` preference (needs to be set to `true`). To change preferences in Firefox, visit about:config. | Opera Android No support No | Safari iOS No support No | Samsung Internet Android No support No | nodejs No support No

### Legend

Full support
  Full support
No support
  No support
Compatibility unknown
  Compatibility unknown
See implementation notes.
  See implementation notes.
User must explicitly enable this feature.
  User must explicitly enable this feature.

## See also

- `SharedArrayBuffer`