dataView.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。
示例
使用byteLength属性
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)The definition of 'DataView.prototype.byteLength' in that specification. | Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262)The definition of 'DataView.prototype.byteLength' in that specification. | Draft | ? |
浏览器兼容性
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
Basic support | 9.0 | (Yes) | 15.0 (15.0) | 10 | 12.1 | 5.1 |
Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
Basic support | 4.0 | (Yes) | (Yes) | 15.0 (15) | ? | 12.0 | 4.2 |
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