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DataView.prototype.byteOffset - JavaScript | MDN
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DataView.prototype.byteOffset

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.

DataView byteOffset ( ) ArrayBuffer SharedArrayBuffer .

In this article

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(16);

const view = new DataView(buffer, 12, 4); // From byte 12 for the next 4 bytes

console.log(view.byteOffset);
// Expected output: 12

byteOffset undefined , . DataView . DataView .

byteOffset

js
const buffer = new ArrayBuffer(8);
const dataview = new DataView(buffer);
dataview.byteOffset; // 0 (  )

const dataview2 = new DataView(buffer, 3);
dataview2.byteOffset; // 3 (DataView   )

Specification
ECMAScript 2027 LanguageSpecification
# sec-get-dataview.prototype.byteoffset

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  2. DataView
    1. DataView()
    1. DataView.prototype.getBigInt64()
    2. DataView.prototype.getBigUint64()
    3. DataView.prototype.getFloat16()
    4. DataView.prototype.getFloat32()
    5. DataView.prototype.getFloat64()
    6. DataView.prototype.getInt8()
    7. DataView.prototype.getInt16()
    8. DataView.prototype.getInt32()
    9. DataView.prototype.getUint8()
    10. DataView.prototype.getUint16()
    11. DataView.prototype.getUint32()
    12. DataView.prototype.setBigInt64()
    13. DataView.prototype.setBigUint64()
    14. DataView.prototype.setFloat16()
    15. DataView.prototype.setFloat32()
    16. DataView.prototype.setFloat64()
    17. DataView.prototype.setInt8()
    18. DataView.prototype.setInt16()
    19. DataView.prototype.setInt32()
    20. DataView.prototype.setUint8()
    21. DataView.prototype.setUint16()
    22. DataView.prototype.setUint32()
    1. DataView.prototype.buffer
    2. DataView.prototype.byteLength
    3. DataView.prototype.byteOffset
  7. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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