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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView/getInt32 below:

DataView.prototype.getInt32() - JavaScript | MDN

Baseline Widely available

getInt32() 方法从 DataView 相对于起始位置偏移 n 个字节处开始，获取一个 32-bit 数 (长整型，4 个字节)。

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

const view = new DataView(buffer);
view.setInt32(1, 2147483647); // Max signed 32-bit integer

console.log(view.getInt32(1));
// Expected output: 2147483647

dataview.getInt32(byteOffset [, littleEndian])

byteOffset

偏移量，单位为字节，从头开始计算。

littleEndian

可选 Indicates whether the 32-bit int is stored in little- or big-endian format. If false or undefined, a big-endian value is read.

一个长整型 32 位数。

RangeError

如果 byteOffset 超出了视图能储存的值，就会抛出错误。

没有对齐约束; 多字节值可以从任何偏移量获取。

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.getInt32(1); // 0

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