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 Latest Draft (ECMA-262)
DataView.prototype.byteLength
Draft  

浏览器兼容性

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support912151012.15.1
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support4 Yes Yes15124.2 Yes

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此页面的贡献者: fscholz, wizardforcel, holynewbie
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