在JavaScript中将IEEE 754从位流转换为浮点数 [英] Converting IEEE 754 from bit stream into float in JavaScript

问题描述

我使用GO语言功能序列化了32位浮点数（ math.Float32bits ）返回对应于IEEE 754二进制表示的浮点数。然后将此数字序列化为32位整数，并作为字节数组读入java脚本。

例如，这是实际数字：

  float：2.8088086 
 as byte array：40 33 c3 85 
 as hex：0x4033c385 
  

有一个 demo converter 显示相同的数字。

我需要从JavaScript中的字节数组中获取相同的浮点数，我不知道该怎么做鉴于您所描述的数据：

  var buffer = new ArrayBuffer（4）; 
 var bytes = new Uint8Array（buffer）; 
 bytes [0] = 0x40; 
 bytes [1] = 0x33; 
 bytes [2] = 0xc3; 
 bytes [3] = 0x85; 
  

我们可以使用 DataView ：

  var view = new DataView（buffer）; 
 //如果你只有一个Uint8Array，你会使用bytes.buffer而不是buffer。 
 
 console.log（view.getFloat32（0，false））; 
  

  2.8088085651397705 
  

  var buffer = new ArrayBuffer（4 ）; var bytes = new Uint8Array（buffer）; bytes [0] = 0x40; bytes [1] = 0x33; bytes [2] = 0xc3; bytes [3] = 0x85; var view = new DataView（buffer）; console.log（view.getFloat32（0，false））;  

I have serialized 32-bit floating number using GO language function (math.Float32bits) which returns the floating point number corresponding to the IEEE 754 binary representation. This number is then serialized as 32-bit integer and is read into java script as byte array.

For example, here is actual number:

float: 2.8088086
as byte array:  40 33 c3 85
as hex: 0x4033c385

There is a demo converter that displays the same numbers.

I need to get that same floating number back from byte array in JavaScript and I have no idea how to do that.

解决方案

Given the data you've described:

var buffer = new ArrayBuffer(4);
var bytes = new Uint8Array(buffer);
bytes[0] = 0x40;
bytes[1] = 0x33;
bytes[2] = 0xc3;
bytes[3] = 0x85;    

We can retrieve the value as a floating-point number using a DataView:

var view = new DataView(buffer);
// If you only had a Uint8Array, you would use bytes.buffer instead of buffer.

console.log(view.getFloat32(0, false));

2.8088085651397705

var buffer = new ArrayBuffer(4);
var bytes = new Uint8Array(buffer);
bytes[0] = 0x40;
bytes[1] = 0x33;
bytes[2] = 0xc3;
bytes[3] = 0x85;    

var view = new DataView(buffer);

console.log(view.getFloat32(0, false));

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