Reactjs代码工作正常，但执行两次。

Question

使用aws进行物联网，我试图在aws核心平台上创建一个证书。下面是我用来执行操作的全部代码。

import {
  IoTClient,
  CreateThingCommand,
  CreateKeysAndCertificateCommand,
} from "@aws-sdk/client-iot";

const Demo = () => {
  var config = {
    region: "us-east-1",
    credentials: {
      accessKeyId: "XXXXXXX",
      secretAccessKey: "XXXXXXX",
    },
  };
  const client = new IoTClient(config);
  (async () => {
    const thingRequest = new CreateThingCommand({
      thingName: "demo-thing-name-using-sdk",
    });
    const certificateRequest = new CreateKeysAndCertificateCommand({setAsActive : true});
    try {
      const thingCreated = await client.send(thingRequest);
      const cert = await client.send(certificateRequest);
      let thingArn = thingCreated.thingArn;
      console.log(cert);
      console.log(thingCreated);
    } catch (error) {
      console.error(error);
    }
  })();
  return null;
};
export default Demo;

上面的代码在aws物联网核心控制台中执行并创建一个东西和两次证书。请帮我解决这个问题

Answer 1

在useEffect中输入代码只运行一次

import React, {  useEffect } from 'react';

然后在你的职能中

useEffect(()=>{
  //enter here your code
},[])