Items printing twice on setInterval

Question

For some reason, every 25000 MS (25 seconds), my ListLabels are being printed out twice. These duplicates are created exactly every 25 seconds. My code is below:

GOT TO LABELS ________________________________
Labels:
- [Imap]/Trash
- DRAFT
- UNREAD
- CATEGORY_UPDATES
- CATEGORY_PROMOTIONS
- INBOX
- CATEGORY_SOCIAL
- CATEGORY_PERSONAL
- CATEGORY_FORUMS
- [Imap]/Drafts
- Notes
- TRASH
- CHAT
- IMPORTANT
- [Imap]/Sent
- STARRED
- SPAM
- SENT
- [Imap]/Outbox
GOT TO LABELS ________________________________
Labels:
- [Imap]/Trash
- DRAFT
- UNREAD
- CATEGORY_UPDATES
- CATEGORY_PROMOTIONS
- INBOX
- CATEGORY_SOCIAL
- CATEGORY_PERSONAL
- CATEGORY_FORUMS
- [Imap]/Drafts
- Notes
- TRASH
- CHAT
- IMPORTANT
- [Imap]/Sent
- STARRED
- SPAM
- SENT
- [Imap]/Outbox

This is my main JS file, it's using modules such as express, as well as some of my own modules.

var express = require('express');
var app = express();
var fs = require('fs');
var getnewtoken = require('./auth.js');
var getauth = require('./getauth.js');
var getnewauth = require('./getnewauth.js');
var SCOPES = ['https://mail.google.com/'];
var google = require('googleapis');
var googleAuth = require('google-auth-library');

// getnewtoken(function (auth) { NEW ACCESS TOKEN
// listLabels(auth);
// });


listLabels();

    function startproccess(token) {
            getauth(token, function (auth) {
                setInterval( function (){
                    listLabels(auth);
                }, 25000)
            });
    }

function listLabels(auth) {
    if(typeof auth === 'undefined'){ // First run, no auth key found
        getnewtoken( function (token) {
            startproccess(token);
        });
        console.log('auth not valid, going to startproccess');
    }
        var gmail = google.gmail('v1');
        gmail.users.labels.list({
                auth: auth,
                userId: 'me@email.com',
        }, function(err, response) {
                if (err) { // API KEY NO LONGER VALID
                        console.log('The API returned an error: ' + err);
                        // Get new access token
                        getnewtoken( function (token) {
                            startproccess(token);
                            console.log("New token added");
                            return;
                        });
                        return;
                }
                var labels = response.labels;
                if (labels.length == 0) {
                        console.log('No labels found.');
                } else {
                        console.log('Labels:');
                        for (var i = 0; i < labels.length; i++) {
                                var label = labels[i];
                                console.log('- %s', label.name);
                        }
                }
        });
}


app.listen(3000, function(){
    //console.log("Listening on port 3000");
});

Answer 1

一次

auth==='undefined' 

你需要打破这个功能，否则它会一直运行到最后。

在您的代码中，您调用函数startproccess两次，而它应该只调用一次。

如果auth ==='undefined'，只需添加“return”，这样函数就会中断。