DataView.prototype.byteLength

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

尝试一下

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

js
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
ECMAScript Language Specification
# sec-get-dataview.prototype.bytelength

浏览器兼容性

BCD tables only load in the browser

参见