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      JS DataView byteLength

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

      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.

      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

      SpecificationStatusComment
      ECMAScript 2015 (6th Edition, ECMA-262)DataView.prototype.byteLengthStandardInitial definition.
      ECMAScript Latest Draft (ECMA-262)DataView.prototype.byteLengthDraft 

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