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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView/buffer below:

DataView.prototype.buffer - JavaScript | MDN

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buffer 属性描述了在构造时被 DataView 引用的 ArrayBuffer。

// Create an ArrayBuffer
const buffer = new ArrayBuffer(123);

// Create a view
const view = new DataView(buffer);

console.log(view.buffer.byteLength);
// Expected output: 123

buffer 属性是一个访问器 (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。

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.buffer; // ArrayBuffer { byteLength: 8 }

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