javascript - 未捕获的类型错误 : Cannot read property 'users' of undefined

Question

我正在使用 Gmail API 发送电子邮件。但出现错误:

Uncaught TypeError: Cannot read property 'users' of undefined

<script type="text/javascript">

    function sendMessage(email, callback) {
        // Web-safe base64 
        var base64EncodedEmail = btoa(email).replace(/\//g, '_').replace(/\+/g, '-');
        var request = gapi.client.gmail.users.messages.send({
            'userId': 'me',
            'message': {
                'raw': base64EncodedEmail
            }
        });
        request.execute(callback);
    }

    function send() {


        var to = 'vijay@itsabacus.com',
         subject = 'Hello World',

         content = 'send a Gmail.'
        var email = "From: 'me'\r\n" +
            "To:  " + to + "\r\n" +
            "Subject: " + subject + "\r\n" +
            "\r\n" +
            content;
            sendMessage(email, function () {
            console.log(arguments);
        });
    }
</script>

Answer 1

我遇到了同样的问题，对我来说，我需要执行以下操作:

gapi.load('client:auth2', () => {
    gapi.client.load('gmail', 'v1', () => {
      console.log('Loaded Gmail');
    });
}

之后，在调试器中我可以像上面那样使用 gmail api:

gapi.client.gmail.users.messages.send({...});

希望这有帮助。