换行符不适用于textarea替换

Question

I'm trying to replace a word in a textarea with another text, but I cannot seem to get newlines to work.

<input type="text" id="testing" value="Newline \n test" /><br />
<textarea>test</textarea><br />
<button>Test</button>

$("button").on("click", function() {
    $("textarea").text($("textarea").text().replace(/test/g, $("#testing").val()));
});

Press the button. It will not replace the \\n with a new line. I tried <br /> , <br> (incorrect HTML), %0A and 
 but it still does not work.

Fiddle

Answer 1

You need to replace the character string '\\n' (2 characters '\\','n') with the actual \\n line break character.

This should do what you need.

var textBoxline = $("#testing").val().replace(/\\n/g, '\n');                                
$("textarea").text($("textarea").text().replace(/test/g, textBoxline));

You will still need to make allowances for leading/trailing spaces around the \\n itself.