ArrayBuffer.prototype.slice() - JavaScript 编辑

The slice() method returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from begin, inclusive, up to end, exclusive.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

arraybuffer.slice(begin[, end])

Parameters

begin

Zero-based byte index at which to begin slicing.

end Optional

Byte index before which to end slicing. If end is unspecified, the new ArrayBuffer contains all bytes from begin to the end of this ArrayBuffer. If negative, it will make the Byte index begin from the last Byte.

Return value

A new ArrayBuffer object.

Description

The slice() method copies up to, but not including, the byte indicated by the end parameter. If either begin or end is negative, it refers to an index from the end of the array, as opposed to from the beginning.

The range specified by the begin and end parameters is clamped to the valid index range for the current array. If the computed length of the new ArrayBuffer would be negative, it is clamped to zero.

Examples

Copying an ArrayBuffer

const buf1 = new ArrayBuffer(8);
const buf2 = buf1.slice(0);

Specifications

Specification
ECMAScript (ECMA-262) The definition of 'ArrayBuffer.prototype.slice' in that specification.

Browser compatibility

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See also

• ArrayBuffer