typedArray.byteLength

byteLength访问器属性表示类型化数组的长度（字节数）。

语法

typedarray.byteLength

描述

byteLength是一个访问器属性，它的 set 访问器函数是undefined，意思是你只能够读取这个属性。它的值在TypedArray构造时建立，不能被修改。如果TypedArray没有指定byteOffset或者length，会返回所引用的ArrayBuffer的length。TypedArray是这里的TypedArray 对象之一。

示例

使用byteLength 属性

var buffer = new ArrayBuffer(8

var uint8 = new Uint8Array(buffer
uint8.byteLength; // 8 (matches the byteLength of the buffer)

var uint8 = new Uint8Array(buffer, 1, 5
uint8.byteLength; // 5 (as specified when constructing the Uint8Array)

var uint8 = new Uint8Array(buffer, 2
uint8.byteLength; // 6 (due to the offset of the constructed Uint8Array)

规范

Specification	Status	Comment
ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'TypedArray.prototype.byteLength' in that specification.	Standard	Initial definition.
ECMAScript Latest Draft (ECMA-262)The definition of 'TypedArray.prototype.byteLength' in that specification.	Draft

浏览器兼容性

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	7.0	4.0 (2)	10	11.6	5.1

Feature	Android	Chrome for Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	4.0	(Yes)	4.0 (2)	10	11.6	4.2