如何在文本框内将一行文本下推？

Question

Let's just say I have this function( function() not shown):

document.getElementById("chatDisplay").value= document.getElementById("chatDisplay").value + userName + ":" + document.getElementById("textBox").value

what I want to do is between chatDisplay (within) the .value= and the userName is too push that line of code down(similar to a <br> ).Is there anyway to get that done?

Answer 1

Use \\n . It works exactly as <br> but it is used for text. It means new line

...."chatDisplay").value + "\n" + userName....

Answer 2

Use 
 Line Feed and 
 Carriage Return instead of <br/> :

 <textarea cols='60' rows='8'>Hello.&#13;&#10;World&#13;&#10;&#13;&#10;How are you?</textarea>