jQuery/JS : empty field after success?

at my ajax call success i wish to empty the field.

   success: function(msg){
     $(wrapperId开发者_开发知识库).prepend(msg);
    }
 }

I tried this:

   success: function(msg){
     $(wrapperId).prepend(msg);
     $('#message').html("");
    }
 }

But it wont work

$('#message').val("");