如何从串口读取完整数据 [已关闭]

问：

我正在尝试从体重秤上获取重量读数。我能够使用网络串行 api 读取重量。 代码如下：

import React, { useState, useEffect } from 'react';

export default function Myscale() {
  let [info, setInfo] = useState(null);
  const [value, setValue] = useState('')
  let start = async () => {
    if ('serial' in navigator) {
      // Prompt user to select an Arduino Uno device.
      const port = await navigator.serial.requestPort();
      const { usbProductId, usbVendorId } = port.getInfo();
      port && setInfo(port.getInfo());
      await port.open({ baudRate: 9600 });
        const reader = port.readable.getReader();
       // Listen to data coming from the serial device.
       while (true) {
         const { value, done } =  await reader.read();
        if (done) {
          // Allow the serial port to be closed later.
           reader.releaseLock();
           break;
        }
      // value is a string.
        function arrayBufferToString(buffer) {
            return String.fromCharCode.apply(null, new Uint16Array(buffer));
          }
        const weight= arrayBufferToString(value)
       //console.log(weight)
       setValue(weight)
       }
 return (
    <div>
      <h1 style={{ textDecoration: 'underline' }}>Web Serial Info</h1>
      <p>
        {info ? (
          <code>{JSON.stringify(info, null, '\t')}</code>
        ) : (
          'Device not selected'
        )}
      </p>
      <button
        onClick={(e) => {
          start();
        }}
      >
        Start
      </button>
      {valu}

    </div>
  );
}

我能够得到重量，但它没有稳定下来。它发送数据的速度太快了。 如何减慢流数据的速度，以便我可以在表单中使用它来将数据发送到后端