SharedArrayBuffer.prototype.slice()
SharedArray Buffer.prototype.slice()
方法返回一个新的SharedArrayBuffer
,其内容是此SharedArrayBuffer
从开始到结束的字节的副本,包括首尾,排他。如果 begin 或 end 为负值,则它引用数组末尾的索引,而不是开头的索引。此方法与Array.prototype.slice()
具有相同的算法。
语法
slice() slice(begin) slice(begin, end)
Parameters
begin
OptionalZero-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 index0
.end
OptionalZero-based index before which to end extraction.
slice
extracts up to but not includingend
.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.
实例
const 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 }