ArrayBuffer - JavaScript 编辑

The ArrayBuffer object is used to represent a generic, fixed-length raw binary data buffer.

It is an array of bytes, often referred to in other languages as a "byte array".You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer.

The ArrayBuffer() constructor creates a new ArrayBuffer of the given length in bytes. You can also get an array buffer from existing data, for example from a Base64 string or from a local file.

Constructor

ArrayBuffer()

Creates a new ArrayBuffer object.

Static properties

get ArrayBuffer[@@species]

The constructor function that is used to create derived objects.

Static methods

ArrayBuffer.isView(arg)

Returns true if arg is one of the ArrayBuffer views, such as typed array objects or a DataView. Returns false otherwise.

Instance properties

ArrayBuffer.prototype.byteLength

The read-only size, in bytes, of the ArrayBuffer. This is established when the array is constructed and cannot be changed.

Instance methods

ArrayBuffer.prototype.slice()

Returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from begin (inclusive) up to end (exclusive). If either begin or end is negative, it refers to an index from the end of the array, as opposed to from the beginning.

Examples

Creating an ArrayBuffer

In this example, we create a 8-byte buffer with a Int32Array view referring to the buffer:

const buffer = new ArrayBuffer(8);
const view = new Int32Array(buffer);

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• JavaScript typed arrays
• SharedArrayBuffer