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• 描述
• 静态方法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

Atomics object provides atomic operations as static methods. They are used with SharedArrayBuffer and ArrayBuffer 对象。

描述

The Atomic operations are installed on an Atomics module. Unlike the other global objects, Atomics is not a constructor. You cannot use it with a new operator or invoke the Atomics object as a function. All properties and methods of Atomics are static (as is the case with the Math object, for example).

Atomic operations

When memory is shared, multiple threads can read and write the same data in memory. Atomic operations make sure that predictable values are written and read, that operations are finished before the next operation starts and that operations are not interrupted.

Wait and notify

wait() and notify() methods are modeled on Linux futexes ("fast user-space mutex") and provide ways for waiting until a certain condition becomes true and are typically used as blocking constructs.

静态方法

Atomics.add()

Adds the provided value to the existing value at the specified index of the array. Returns the old value at that index.

Atomics.and()

Computes a bitwise AND on the value at the specified index of the array with the provided value. Returns the old value at that index.

Atomics.compareExchange()

Stores a value at the specified index of the array, if it equals a value. Returns the old value.

Atomics.exchange()

Stores a value at the specified index of the array. Returns the old value.

Atomics.isLockFree(size)

An optimization primitive that can be used to determine whether to use locks or atomic operations. Returns true if an atomic operation on arrays of the given element size will be implemented using a hardware atomic operation (as opposed to a lock). Experts only.

Atomics.load()

Returns the value at the specified index of the array.

Atomics.notify()

Notifies agents that are waiting on the specified index of the array. Returns the number of agents that were notified.

Atomics.or()

Computes a bitwise OR on the value at the specified index of the array with the provided value. Returns the old value at that index.

Atomics.store()

Stores a value at the specified index of the array. Returns the value.

Atomics.sub()

Subtracts a value at the specified index of the array. Returns the old value at that index.

Atomics.wait()

Verifies that the specified index of the array still contains a value and sleeps awaiting or times out. Returns either " ok ", " not-equal ", or " timed-out ". If waiting is not allowed in the calling agent then it throws an Error exception. (Most browsers will not allow wait() on the browser's main thread.)

Atomics.xor()

Computes a bitwise XOR on the value at the specified index of the array with the provided value. Returns the old value at that index.

范例

Using Atomics

const sab = new SharedArrayBuffer(1024);
const ta = new Uint8Array(sab);
ta[0] = 5;
Atomics.add(ta, 0, 12);
Atomics.load(ta, 0); // 12
Atomics.and(ta, 0, 1);
Atomics.load(ta, 0);  // 1
Atomics.compareExchange(ta, 0, 5, 12);
Atomics.load(ta, 0); // 12
Atomics.exchange(ta, 0, 12);
Atomics.load(ta, 0); // 12
Atomics.isLockFree(1); // true
Atomics.isLockFree(2); // true
Atomics.isLockFree(3); // false
Atomics.isLockFree(4); // true
Atomics.or(ta, 0, 1);
Atomics.load(ta, 0);  // 5
Atomics.store(ta, 0, 12); // 12
Atomics.sub(ta, 0, 2);
Atomics.load(ta, 0); // 3
Atomics.xor(ta, 0, 1);
Atomics.load(ta, 0); // 4
					

Waiting and notifiying

Given a shared Int32Array :

const sab = new SharedArrayBuffer(1024);
const int32 = new Int32Array(sab);
					

A reading thread is sleeping and waiting on location 0 which is expected to be 0. As long as that is true, it will not go on. However, once the writing thread has stored a new value, it will be notified by the writing thread and return the new value (123).

Atomics.wait(int32, 0, 0);
console.log(int32[0]); // 123
					

A writing thread stores a new value and notifies the waiting thread once it has written:

console.log(int32[0]); // 0;
Atomics.store(int32, 0, 123);
Atomics.notify(int32, 0, 1);
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Atomics' 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
Atomics	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
Atomic operations on non-shared ArrayBuffer 对象	Chrome No	Edge No	Firefox 79	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android No	nodejs No
add	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
and	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
compareExchange	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
exchange	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
isLockFree	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
load	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
notify	Chrome 68 68 不支持 60 — 63 Alternate Name 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. Alternate Name Uses the non-standard name: wake	Edge 79	Firefox 78 78 63 Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Disabled From version 63: this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 57 Alternate Name Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Alternate Name Uses the non-standard name: wake 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. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 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. 不支持 46 — 48 Alternate Name Disabled count parameter defaults to 0 instead of the later-specified +Infinity . Alternate Name Uses the non-standard name: futexWake Disabled ). To change preferences in Firefox, visit about:config.	IE No	Opera No	Safari 10.1 — 11.1 Alternate Name 不支持 10.1 — 11.1 Alternate Name Alternate Name Uses the non-standard name: wake	WebView Android 60 — 63 Alternate Name 不支持 60 — 63 Alternate Name 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. Alternate Name Uses the non-standard name: wake	Chrome Android 60 — 63 Alternate Name 不支持 60 — 63 Alternate Name 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. Alternate Name Uses the non-standard name: wake	Firefox Android 63 Disabled 63 Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Disabled From version 63: this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 57 Alternate Name Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Alternate Name Uses the non-standard name: wake 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. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 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. 不支持 46 — 48 Alternate Name Disabled count parameter defaults to 0 instead of the later-specified +Infinity . Alternate Name Uses the non-standard name: futexWake Disabled ). To change preferences in Firefox, visit about:config.	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No Alternate Name 不支持 No Alternate Name 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. Alternate Name Uses the non-standard name: wake	nodejs 8.10.0 Alternate Name 8.10.0 Alternate Name Alternate Name Uses the non-standard name: wake
or	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
store	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
sub	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
wait	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 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. 不支持 46 — 48 Alternate Name Disabled The method returns values Atomics.OK , Atomics.TIMEDOUT ，和 Atomics.NOTEQUAL , instead of the later-specified strings. Alternate Name Uses the non-standard name: futexWait Disabled ). To change preferences in Firefox, visit about:config.	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 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. 不支持 46 — 48 Alternate Name Disabled The method returns values Atomics.OK , Atomics.TIMEDOUT ，和 Atomics.NOTEQUAL , instead of the later-specified strings. Alternate Name Uses the non-standard name: futexWait Disabled ). To change preferences in Firefox, visit about:config.	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0
xor	Chrome 68 68 不支持 60 — 63 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 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 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 60 — 63 不支持 60 — 63 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.	Firefox Android 57 Disabled 57 Disabled 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. 不支持 55 — 57 不支持 46 — 55 Disabled Disabled ). To change preferences in Firefox, visit	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No 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.	nodejs 8.10.0

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

使用非标名称。

另请参阅

• ArrayBuffer
• JavaScript 类型数组
• Web 工作者
• parlib-simple – a simple library providing synchronization and work distribution abstractions.
• Shared Memory – a brief tutorial
• A Taste of JavaScript’s New Parallel Primitives – Mozilla Hacks

元数据

• 最后修改： Jul 7, 2020

相关话题

1. 标准内置对象
2. Atomics
3. 方法
   1. Atomics.add()
   2. Atomics.and()
   3. Atomics.compareExchange()
   4. Atomics.exchange()
   5. Atomics.isLockFree()
   6. Atomics.load()
   7. Atomics.notify()
   8. Atomics.or()
   9. Atomics.store()
   10. Atomics.sub()
   11. Atomics.wait()
   12. Atomics.xor()
4. 继承：
5. Object
6. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
7. 方法
   1. Object.prototype.__defineGetter__()
   2. Object.prototype.__defineSetter__()
   3. Object.prototype.__lookupGetter__()
   4. Object.prototype.__lookupSetter__()
   5. Object.prototype.hasOwnProperty()
   6. Object.prototype.isPrototypeOf()
   7. Object.prototype.propertyIsEnumerable()
   8. Object.prototype.toLocaleString()
   9. Object.prototype.toSource()
   10. Object.prototype.toString()
   11. Object.prototype.valueOf()
   12. Object.setPrototypeOf()