What is the difference between "" and "\ r \ n ??

\ R \ n is the output htmlCodeLine feed.
<Br/> the opposite is true.
Effect:
I am content \ r \ n I am content

I am content <br/> I am content

========================================================== ============
\ R: The carriage return (acⅱ: 13 or 0x0d) is what we often call a hard carriage return.
\ N indicates a line feed (acⅱ: 10 or 0x0a), which is a soft carriage return.

The two files on the page do not have any effect. Right-click to view the source file.Code line feed

========================================================== ============
If it is output to the browser, use <br/>
If it is output to your own file, use "\ n" and "\ r \ n" in windows"

========================================================== ============
\ N, like creating a webpage in DreamweaverSource codePress enter to wrap the source code.
Is the output (HTML Markup Language), which is interpreted as a line break in HTML. \ N is used to wrap the source code. After the input, you can view the HTML source code to see a line break. The HTML interpreter (browser) thinks it is useless, it is displayed in the same way.

========================================================== ============

\ N is a line feed of source code!
<Br/> webpage display line feed !!

========================================================== ============