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• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

byteLength accessor property represents the length (in bytes) of this view from the start of its ArrayBuffer or SharedArrayBuffer .

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

描述

byteLength property is an accessor property whose set accessor function is undefined , meaning that you can only read this property. The value is established when an DataView is constructed and cannot be changed. If the DataView is not specifying an offset or a byteLength ， byteLength of the referenced ArrayBuffer or SharedArrayBuffer will be returned.

范例

使用 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

规范
ECMAScript (ECMA-262) The definition of 'DataView.prototype.byteLength' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
byteLength	Chrome 9	Edge 12	Firefox 15	IE 10	Opera 12.1	Safari 5.1	WebView Android 4	Chrome Android 18	Firefox Android 15	Opera Android 12.1	Safari iOS 4.2	Samsung Internet Android 1.0	nodejs 0.10

图例

完整支持

完整支持

另请参阅

• DataView
• ArrayBuffer
• SharedArrayBuffer

元数据

• 最后修改： May 21, 2020

相关话题

1. 标准内置对象
2. DataView
3. 特性
   1. DataView.prototype.buffer
   2. DataView.prototype.byteLength
   3. DataView.prototype.byteOffset
4. 方法
   1. DataView.prototype.getBigInt64()
   2. DataView.prototype.getBigUint64()
   3. DataView.prototype.getFloat32()
   4. DataView.prototype.getFloat64()
   5. DataView.prototype.getInt16()
   6. DataView.prototype.getInt32()
   7. DataView.prototype.getInt8()
   8. DataView.prototype.getUint16()
   9. DataView.prototype.getUint32()
   10. DataView.prototype.getUint8()
   11. DataView.prototype.setBigInt64()
   12. DataView.prototype.setBigUint64()
   13. DataView.prototype.setFloat32()
   14. DataView.prototype.setFloat64()
   15. DataView.prototype.setInt16()
   16. DataView.prototype.setInt32()
   17. DataView.prototype.setInt8()
   18. DataView.prototype.setUint16()
   19. DataView.prototype.setUint32()
   20. DataView.prototype.setUint8()
5. 继承：
6. Function
7. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
8. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
9. Object
10. 特性
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
11. 方法
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.valueOf()
    12. Object.setPrototypeOf()