angularjs not executing deferred promise using angular-socket-io

问题

After solving this issue I now have a new issue with angular halting inside a function that's waiting on a socket connection.

Controller:

.controller('myCtrl',function($scope, socket) {

  var sendMsg = function(msg) {
    socket.then(function(msg) {
      socket.emit('newMsg', msg);
    });
  }

  //simplified example
  var msg = 'Hi Mom!';
  sendMsg(msg);

});

The problem is that socket.emit() never gets fired. If I remove socket.then() I will get an error socket.emit is not a function. We have to wait for socket to be initialized (which is based on successful login in another controller and broadcast through the socket factory). Is this a chicken-egg paradox? How can I fire socket.emit in another function? Other similar functions work, such as:

socket.then(function(socket) {
 socket.on('connect',function() {
   //do something. This works.
 });
});

回答1:

The problem seems to be that you are having two msg parameters. However, the second one is the socket:

var sendMsg = function(msg) {
    socket.then(function(socket) { // <--
        socket.emit('newMsg', msg);
    });
}

来源：https://stackoverflow.com/questions/35044402/angularjs-not-executing-deferred-promise-using-angular-socket-io