MDN wants to talk to developers like you: https://qsurvey.mozilla.com/s3/8d22564490d8

DataView.prototype.byteLength

 byteLength 属性描述了视图从它的 ArrayBuffer 开始的字节长度。

语法

dataview.byteLength

描述

byteLength 属性是一个获取(accessor)属性,它的 set 属性为 undefined,这意味着它是只读的。值在 DataView 被创建时就确定了,且不能改变。如果 DataView 没有指定偏移量或byteLength,那么被引用的 ArrayBuffer 的字节长度将被返回。

Examples

Using the byteLength property

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.byteLength; // 8 (matches the byteLength of the buffer)

var dataview2 = new DataView(buffer, 1, 5);
dataview2.byteLength; // 5 (as specified when constructing the DataView)

var dataview3 = new DataView(buffer, 2);
dataview3.byteLength; // 6 (due to the offset of the constructed DataView)

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
DataView.prototype.byteLength
Standard Initial definition.
ECMAScript 2017 Draft (ECMA-262)
DataView.prototype.byteLength
Draft  

浏览器兼容性

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 9.0 15.0 (15.0) 10 12.1 5.1
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.0 (Yes) 15.0 (15) ? 12.0 4.2

相关链接

文档标签和贡献者

 此页面的贡献者: wizardforcel, holynewbie
 最后编辑者: wizardforcel,