textarea 中的换行符
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <textarea cols="50" rows="5" id="textareaid">"5456455d4fgdfgdgdg dsfafdadfadfafa"</textarea> </body> </html>

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <textarea cols="50" rows="5" id="textareaid">"5456455d4fgdfgdgdg dsfafdadfadfafa"</textarea> </body> </html>
