first time execute ph.createPage , socket.io seems not prepared

[zhouseahe]

first time I run

ph.createPage(function(err,page){
   // no code run here 
});

it didn't work .
I need to execute like this

setTimeout(function(){
    ph.createPage(function(err,page){
    });
},500);
I think 

phantom.create(function(error,ph){
});

callback executed but socket.io not prepared.