我如何在node.js中将数组从服务器端传输到客户端？

Question

I have the following function on the client side:

                //TODO: to fix
                var socket = io.connect('http://localhost:3000/home');
                socket.on('news', function (data) {
                    console.log('testing: ' + data);
                    //socket.emit('my other event', {my: 'data'});
                });

And the following on the server side:

module.exports = function(app, io) {

    app.get('/home',function(req, res){
        //res.render('profile.ejs');
    });
    io.on('connection', function(socket){
        socket.emit('news', {
        data: 'world'
        });
};

The problem is that I can't seem to log the received data to the client's console. What's wrong with my code?

Answer 1

使用JSON.stringify（）以适当的格式打印整个数据

console.log('testing: ' + JSON.stringify(data));

Answer 2

By calling console.log('testing: ' + data); , Javascript is trying to convert the object data to a string, by calling toString . This will result in the string "testing: [object Object]".

You need to either manually convert the object to a more useful string, eg by calling JSON.stringify(data) , or you can make use of the feature that console.log may receive multiple arguments:

console.log('testing:', data);

This way your console is printing the acutall object and not a string representation.