PhantomJS onConsoleMessage()

page.onConsoleMessage = function(msg, lineNum, sourceId) {};

var wpage = require('webpage').create(); 
wpage.onConsoleMessage = function(msg) { 
   console.log('CONSOLE Message: ' + msg ); 
}; 
wpage.open('http://localhost/tasks/test.html', function(status) { 
   var script1 = "function(){ console.log('hello world');}"; 
   var value = wpage.evaluate(script1); 
   phantom.exit(); 
});

CONSOLE Message: hello world