TypedArray.prototype.length
TypedArray
实例的 length
访问器属性返回此类型化数组的长度(以元素为单位)。
¥The length
accessor property of TypedArray
instances returns the length (in elements) of this typed array.
Try it
描述
¥Description
length
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
的长度。TypedArray 是 类型数组对象.1 之一。
¥The length
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 length
属性
¥Using the length
property
const buffer = new ArrayBuffer(8);
let uint8 = new Uint8Array(buffer);
uint8.length; // 8 (matches the length of the buffer)
uint8 = new Uint8Array(buffer, 1, 5);
uint8.length; // 5 (as specified when constructing the Uint8Array)
uint8 = new Uint8Array(buffer, 2);
uint8.length; // 6 (due to the offset of the constructed Uint8Array)
规范
Specification |
---|
ECMAScript Language Specification # sec-get-%typedarray%.prototype.length |
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¥See also