如何通过Gmail API在JavaScript中发送带有附件和消息的邮件

// 客户端ID和客户端密钥
var clientId = 'YOUR_CLIENT_ID';
var clientSecret = 'YOUR_CLIENT_SECRET';

// 授权范围
var scopes = ['https://www.googleapis.com/auth/gmail.send'];

// 在Google API客户端库中进行身份验证和授权
function authorize(callback) {
  gapi.auth.authorize({
    client_id: clientId,
    client_secret: clientSecret,
    scope: scopes,
    immediate: false
  }, callback);
}

// 发送邮件
function sendEmail() {
  var email = '';
  var rawEmail = btoa(email).replace(/\+/g, '-').replace(/\//g, '_');

  var request = gapi.client.gmail.users.messages.send({
    'userId': 'me',
    'resource': {
      'raw': rawEmail
    }
  });

  request.execute(function(response) {
    console.log(response);
  });
}

// 加载Google API客户端库
function loadGmailApi() {
  gapi.client.load('gmail', 'v1', sendEmail);
}

// 初始化
function init() {
  gapi.client.setApiKey('YOUR_API_KEY');
  authorize(loadGmailApi);
}