如何在JavaScript中将双精度（64位）数字转换/存储为32位浮点数或UInt16 [英] How to convert/store a double precision (64bit) number to a 32 bit float or a UInt16 in javascript

问题描述

假设我可以在一定程度上消除数字/精度的损失。我发现通过网络发送一个64位（8字节）的号码有时是过度的。我希望数据使用更少的带宽，但保持一定的准确性。但我不知道正确的方式来存储一个数字在JavaScript中的32位或16位数据。

你可以将一个JavaScript数字转换成一个32位浮点数或一个16位无符号整数的数组缓冲区：
$ b

  let float64 = 3.141592653589793238462643383279502884197; let float32View = new DataView（new ArrayBuffer（4））; float32View.setFloat32（0，float64）; let uint16View = new DataView（new ArrayBuffer（2））; uint16View.setUint16 （0，float64）; console.log（float64）; console.log（float32View.getFloat32（0））; console.log（uint16View.getUint16（0））;  

Assume I can bare the loss of digits/precision to some degree. I find that to send a 64bit (8 bytes) number over the network sometimes is overkilled. I want the data to use less bandwidth but maintain certain accuracy. But I don't know the correct way to store a number in 32 bit or 16 bit data in javascript.

解决方案

Here's how you can convert a JavaScript number to an array buffer holding a 32 bit float or a 16 bit unsigned integer:

let float64 = 3.141592653589793238462643383279502884197;

let float32View = new DataView(new ArrayBuffer(4));
float32View.setFloat32(0, float64);

let uint16View = new DataView(new ArrayBuffer(2));
uint16View.setUint16(0, float64);

console.log(float64);
console.log(float32View.getFloat32(0));
console.log(uint16View.getUint16(0));

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