There appeared a problem, you need to postpone the string in TextAREA. Usually used & amp; # 013; & amp; # 010;, but if you try to generate the contents through JS, the row translation symbols will be read as text.
How is it better to get their this position?
Apply the FID for clarity:
Answer 1, Authority 100%
$ ("textarea"). HTML ("This Is My Statement One. & amp; # 13; & amp; # 10; This is my statement2 ");
$ ("textarea"). HTML ("This is My Statement One. \ Nthis is My Statement2");