Ohai！对于在这里跌倒的其他人，有几件事。首先-我们现在在这里有一个完整的端到端发送邮件示例：

https://github.com/google/google-api-nodejs-client/blob/master/samples/gmail/send.js

其次，上面的答案基本上是正确的：）而不是安装最新版本的google-auth-Library…只是把它从你的pack. json中删除。入门指南非常非常错误（它已经被修复了）。googelapis引入了它自己兼容的google-auth-Library版本，所以你真的不想因为安装自己的版本而弄乱它：）

快速入门指定：

npm install google-auth-library@0.* --save

当我把这个改成

npm install google-auth-library -- save

它引入了1.3.1 vs 0.12.0版本。一旦我更改代码以解释重大更改，一切都开始工作。最新版本的googleapis也有重大更改。这是我对快速入门的调整：

包. json

 ....
  "dependencies": {
    "google-auth-library": "^1.3.1",
    "googleapis": "^26.0.1"
  }

快速入门. js

var fs = require('fs');
var readline = require('readline');
var {google} = require('googleapis');
const {GoogleAuth, JWT, OAuth2Client} = require('google-auth-library');


var SCOPES = [
    'https://mail.google.com/',
    'https://www.googleapis.com/auth/gmail.modify',
    'https://www.googleapis.com/auth/gmail.compose',
    'https://www.googleapis.com/auth/gmail.send'
];

var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
    process.env.USERPROFILE) + '/.credentials/';
var TOKEN_PATH = TOKEN_DIR + 'gmail-nodejs-quickstart.json';

function authorize(credentials, callback) {
    var clientSecret = credentials.installed.client_secret;
    var clientId = credentials.installed.client_id;
    var redirectUrl = credentials.installed.redirect_uris[0];
    var auth = new GoogleAuth();
    var oauth2Client = new OAuth2Client(clientId, clientSecret, redirectUrl);

    // Check if we have previously stored a token.
    fs.readFile(TOKEN_PATH, function (err, token) {
        if (err) {
            getNewToken(oauth2Client, callback);
        } else {
            oauth2Client.credentials = JSON.parse(token);
            callback(oauth2Client);
        }
    });
}

function getNewToken(oauth2Client, callback) {
    var authUrl = oauth2Client.generateAuthUrl({
        access_type: 'offline',
        scope: SCOPES
    });
    console.log('Authorize this app by visiting this url: ', authUrl);
    var rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout
    });
    rl.question('Enter the code from that page here: ', function (code) {
        rl.close();
        oauth2Client.getToken(code, function (err, token) {
            if (err) {
                console.log('Error while trying to retrieve access token', err);
                return;
            }
            oauth2Client.credentials = token;
            storeToken(token);
            callback(oauth2Client);
        });
    });
}


function makeBody(to, from, subject, message) {
    var str = ["Content-Type: text/plain; charset=\"UTF-8\"\n",
        "MIME-Version: 1.0\n",
        "Content-Transfer-Encoding: 7bit\n",
        "to: ", to, "\n",
        "from: ", from, "\n",
        "subject: ", subject, "\n\n",
        message
    ].join('');

    var encodedMail = new Buffer(str).toString("base64").replace(/\+/g, '-').replace(/\//g, '_');
        return encodedMail;
}

function sendMessage(auth) {
    var gmail = google.gmail('v1');
    var raw = makeBody('xxxxxxxx@hotmail.com', 'xxxxxxx@gmail.com', 'test subject', 'test message');
    gmail.users.messages.send({
        auth: auth,
        userId: 'me',
        resource: {
            raw: raw
        }
    }, function(err, response) {
        console.log(err || response)
    });
}

const secretlocation = 'client_secret.json'

fs.readFile(secretlocation, function processClientSecrets(err, content) {
    if (err) {
        console.log('Error loading client secret file: ' + err);
        return;
    }
    // Authorize a client with the loaded credentials, then call the
    // Gmail API.
    authorize(JSON.parse(content), sendMessage);
});

现在当我跑的时候，我得到了回应

Object {status: 200, statusText: "OK", headers: Object, config: Object, request: ClientRequest, …}