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 of the referenced
SharedArrayBuffer will be returned.
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)
The definition of 'DataView.prototype.byteLength' in that specification.
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