textarea中的空格与换行

当在一个textarea标签中键入一个回车时，实际上会插入2个符号：


在javascript里， line breaks用
表示
when you pull text into Javascript, it treats line breaks as the single "
" value.

1. In Javascript, new lines are represented by a single " " character.
2. Textarea values might have the character combos " " in the text box, but once they are pulled into Javascript, " " becomes JUST " ".
3. When replacing out new line characters, treat them as you would any other character. They are not special, they just have special notation.

Ask Ben: Javascript Replace And Multiple Lines / Line Breaks