DataView.prototype.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。
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)