如何在 javascript 中将值从一个 javascript 文件传递​​到另一个

如何解决如何在 javascript 中将值从一个 javascript 文件传递​​到另一个

index.js

const fs = require('fs');
const readline = require('readline');
const {google} = require('googleapis');
let mailparser = require('mailparser')
var htmlBody='';
var dict1 = "10";

// If modifying these scopes,delete token.json.
const ScopES = ['https://www.googleapis.com/auth/gmail.readonly'];
// The file token.json stores the user's access and refresh tokens,and is
// created automatically when the authorization flow completes for the first
// time.
const TOKEN_PATH = 'token.json';

const SSU_Helper = require('../../Objects/SSU_Common/SSU_Helper');
const { catchEmailBody } = require('../../Objects/SSU_Common/SSU_Helper');

// Load client secrets from a local file.
fs.readFile('credentials.json',(err,content) => {
  if (err) return console.log('Error loading client secret file:',err);
  // Authorize a client with credentials,then call the Gmail API.
  authorize(JSON.parse(content),listLabels);
});


/**
 * Create an OAuth2 client with the given credentials,and then execute the
 * given callback function.
 * @param {Object} credentials The authorization client credentials.
 * @param {function} callback The callback to call with the authorized client.
 */
 function authorize(credentials,callback) {
  console.log("----------------A----------------------");
  const {client_secret,client_id,redirect_uris} = credentials.installed;
  const oauth2client = new google.auth.OAuth2(
      client_id,client_secret,redirect_uris[0]);

  // Check if we have prevIoUsly stored a token.
  fs.readFile(TOKEN_PATH,token) => {
    if (err) return getNewToken(oauth2client,callback);
    oauth2client.setCredentials(JSON.parse(token));
    callback(oauth2client);
  });
}

/**
 * Get and store new token after prompting for user authorization,and then
 * execute the given callback with the authorized OAuth2 client.
 * @param {google.auth.OAuth2} oauth2client The OAuth2 client to get token for.
 * @param {getEventsCallback} callback The callback for the authorized client.
 */
 function getNewToken(oauth2client,callback) {
  console.log("----------------B----------------------");
  const authUrl = oauth2client.generateAuthUrl({
    access_type: 'offline',scope: ScopES,});
  console.log('Authorize this app by visiting this url:',authUrl);
  const rl = readline.createInterface({
    input: process.stdin,output: process.stdout,});
  rl.question('Enter the code from that page here: ',(code) => {
    rl.close();
    oauth2client.getToken(code,token) => {
      if (err) return console.error('Error retrieving access token',err);
      oauth2client.setCredentials(token);
      // Store the token to disk for later program executions
      fs.writeFile(TOKEN_PATH,JSON.stringify(token),(err) => {
        if (err) return console.error(err);
        console.log('Token stored to',TOKEN_PATH);
      });
      callback(oauth2client);
    });
  });
}


function listMessages(auth,query){
  console.log("----------------D----------------------");
    query = '[e-mail]';
    return new Promise((resolve,reject) => {    
      const gmail = google.gmail({version: 'v1',auth});
      gmail.users.messages.list(      
        {        
          userId: 'me',q:query,maxResults:5     
        },res) => {        
          if (err) {                    reject(err);          
            return;        
          }        
          if (!res.data.messages) {                    resolve([]);          
            return;        
          }                resolve(res.data);  
  
                           getMail(res.data.messages[0].id,auth);
        }    
      );  
    })
  }

  fs.readFile('credentials.json',content) => {
    console.log("----------------E----------------------");
    if (err) return console.log('Error loading client secret file:',err);
    // Authorize a client with credentials,then call the Gmail API.
    authorize(JSON.parse(content),listMessages);
  
  });

 

  function getMail(msgid,auth){

    console.log("----------------F----------------------");
    console.log(msgid)
    const gmail = google.gmail({version: 'v1',auth});
    //This api call will fetch the mailbody.
    gmail.users.messages.get({
        userId:'me',id: msgid,},res) => {
      console.log(res.data.labelIds.INBox)
        if(!err){
          console.log("no error")
            var body = res.data.payload.parts[0].body.data;
  
            htmlBody = Buffer.from((body.replace(/-/g,'+').replace(/_/g,'/')),"base64").toString();
           

console.log(htmlBody)

        }
    });
  }

Gmail.js

class Gmail {
 gmailIntegration(){
        const output = execSync('cd ./Objects/email_common; node index.js',{ encoding: 'utf-8' });  // the default is 'buffer'
        console.log('Output was:\n',output);

}

我有两个文件 index.js 和 Gmail.js，在 Gmail 类的 gmailIntegration() 方法中，我使用命令 exexSync 通过终端运行 index.js，它会将 htmlBody 打印到控制台，但我需要在 Gmail 类中的 gmailIntegration() 函数中使用 htmlBody 变量，如何从 gmailIntegration() 函数中的 index.js 访问 htmlBody 变量？