alert 창에서 줄바꿈

1.
<scirpt type="text/javascript">

alert('줄바꿈전 \n줄바꿈후);

</script> 


2. 
 out.println("<script type='text/javascript'>");

out.println("alert('줄바꿈전 \\n줄바꿈후');");

out.println("</script>");