The Javascript DataView byteOffset property represents the offset in bytes of this view.
dataview.byteOffset
Using the byteOffset property
var buffer = new ArrayBuffer(8); var dataview = new DataView(buffer); console.log(dataview.byteOffset); // 0 (no offset specified) var dataview2 = new DataView(buffer, 3); console.log(dataview2.byteOffset); // 3 (specified when constructing the DataView)