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

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.

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.

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 }

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