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Showing content from http://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/DataView/setFloat64 below:

DataView.prototype.setFloat64() - JavaScript | MDN

Baseline Widely available

setFloat64() 从 DataView 起始位置以 byte 为计数的指定偏移量 (byteOffset) 处储存一个 64-bit 数 (双精度浮点型)。

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

const view = new DataView(buffer);
view.setFloat64(1, Math.PI);

console.log(view.getFloat64(1));
// Expected output: 3.141592653589793

dataview.setFloat64(byteOffset, value [, littleEndian])

byteOffset

偏移量，从头开始计算，单位为字节。

value

设置的数值。

littleEndian

可选 Indicates whether the 64-bit float is stored in little- or big-endian format. If false or undefined, a big-endian value is written.

undefined.

RangeError

如果 byteOffset 超出了视图能储存的值，就会抛出错误。

var buffer = new ArrayBuffer(8);
var dataview = new DataView(buffer);
dataview.setFloat64(0, 3);
dataview.getFloat64(0); // 3

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