function break_lines(v){ //TEXTAREA "#t" VALUE
var text = v.replace(/\n/gi, "<br>"); //FOR EVERY "LINE" IN THE TEXTAREA, A <br> WILL BE IN HTML
$("#text").html(text); //NEW TEXT WILL BE DISPLAYED IN HTML
}
<textarea id="t" onClick="break_lines(this.value)"></textarea>

function break_lines(v){ //TEXTAREA "#t" VALUE
var text = v.replace(/\n/gi, "<br>"); //FOR EVERY "LINE" IN THE TEXTAREA, A <br> WILL BE IN HTML
document.getElementById("text").innerHTML = text;
}
<textarea id="t" onClick="break_lines(this.value)"></textarea>