use this code
var dlg = $.messager.prompt('Enter Password', 'Please enter password', function(r){
if (r){
alert('you type: '+r);
}
});
dlg.find('.messager-input').attr('type', 'password');
Please refer to this example
http://code.reloado.com/jbhatti/29/edit#html,live
Nice , your code is better , I just do like this
$.messager.prompt('Enter Password', 'Please enter password', function(r){
if (r){
alert('you type: '+r);
}
});
$('.messager-input').attr('type', 'password');