All Inner HTML
If you want to retrieve all inner html in multiple <span> with same class name, here is an example:
...
var msg_array = document.getElementsByClassName("info");
var message = "";
for (var i = 0; i < msg_array.length; i++) {
message += msg_array.item(i).innerHTML;
message += "\n";
}
if (message != "")
alert(message);
}
...
Note that, we add a line break character after every element for formatting the output message.