TypedArray.prototype.byteLength
TypedArray
实例的 byteLength
访问器属性返回此类型化数组的长度(以字节为单位)。
¥The byteLength
accessor property of TypedArray
instances returns the length (in bytes) of this typed array.
Try it
描述
¥Description
byteLength
属性是一个访问器属性,其设置的访问器函数为 undefined
,这意味着你只能读取该属性。该值是在构造 TypedArray 时确定的,并且无法更改。如果 TypedArray 未指定 byteOffset
或 length
,则将返回引用的 ArrayBuffer
的 length
。TypedArray 是 类型数组对象.1 之一。
¥The byteLength
property is an accessor property whose set accessor function is undefined
, meaning that you can only read this property. The value is established when a TypedArray is constructed and cannot be changed. If the TypedArray is not specifying a byteOffset
or a length
, the length
of the referenced ArrayBuffer
will be returned. TypedArray is one of the TypedArray objects.
示例
使用 byteLength 属性
¥Using the byteLength property
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer);
uint8.byteLength; // 8 (matches the byteLength of the buffer)
const uint8newLength = new Uint8Array(buffer, 1, 5);
uint8newLength.byteLength; // 5 (as specified when constructing the Uint8Array)
const uint8offSet = new Uint8Array(buffer, 2);
uint8offSet.byteLength; // 6 (due to the offset of the constructed Uint8Array)
规范
Specification |
---|
ECMAScript Language Specification # sec-get-%typedarray%.prototype.bytelength |
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¥See also