컨트롤엔터시 줄바꿈 질문 채택완료

$("#start").keydown(function(e) {
  if (e.ctrlKey && e.keyCode == 13) {
    e.preventDefault();
    var val = $("#start").val();
    var start = this.selectionStart;
    var end = this.selectionEnd;
    var chat= val.substring(0, start) + "<br>" + val.substring(end, val.length);
    $("#status_message").val(chat);
  }else if(e.keyCode == 13){
      e.preventDefault();
        var val = $(this).val();
        Insert();
        $(this).val("");
  }
});

var chat= val.substring(0, start) + "\n" + val.substring(end, val.length);