SharedArrayBuffer.prototype.slice()
方法返回一个新的SharedArrayBuffer
其内容是该SharedArrayBuffer的字节从开始包含,直到结束,独占的副本。如果开始或结束是负的,它指的是从数组末尾开始的索引。此方法与 Array.prototype.slice()
具有相同的算法。
Syntax
sab.slice()
sab.slice(begin)
sab.slice(begin, end)
Parameters
begin
可选
- Zero-based index at which to begin extraction.
- A negative index can be used, indicating an offset from the end of the sequence.
slice(-2)
extracts the last two elements in the sequence.
- If
begin
is undefined, slice
begins from index 0
.
end
可选
- Zero-based index before which to end extraction.
slice
extracts up to but not including end
.
- For example,
slice(1,4)
extracts the second element through the fourth element (elements indexed 1, 2, and 3).
- A negative index can be used, indicating an offset from the end of the sequence.
slice(2,-1)
extracts the third element through the second-to-last element in the sequence.
- If
end
is omitted, slice
extracts through the end of the sequence (sab.byteLength
).
Return value
A new SharedArrayBuffer
containing the extracted elements.
Examples
var sab = new SharedArrayBuffer(1024);
sab.slice(); // SharedArrayBuffer { byteLength: 1024 }
sab.slice(2); // SharedArrayBuffer { byteLength: 1022 }
sab.slice(-2); // SharedArrayBuffer { byteLength: 2 }
sab.slice(0, 1); // SharedArrayBuffer { byteLength: 1 }
Specifications
Browser compatibility
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 |
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slice | Chrome
Full support
68-
Full support
68
-
No support
60 — 63
- 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-
No support
16 — 17
- Notes Support was removed to mitigate speculative execution side-channel attacks (Windows blog).
| Firefox
Full support
57-
Full support
57
- 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 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-
No support
60 — 63
- 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-
No support
60 — 63
- 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-
Full support
57
- 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 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
Full support
8.10.0 |
---|
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