DataView.prototype.byteLength
byteLength
属性描述了视图从它的 ArrayBuffer
开始的字节长度。
尝试一下
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 |
---|
ECMAScript Language Specification # sec-get-dataview.prototype.bytelength |
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