);
var elWriter = document.querySelector("#writer");
var elToEditor = elWriter.querySelector(".to-editor");
var elToPreviewer = elWriter.querySelector(".to-previewer");
var elEditor = elWriter.querySelector(".editor");
var elPreviewer = elWriter.querySelector(".previewer");
var elPreviewerContent = elPreviewer.querySelector("article");
var elUpdate = elWriter.querySelector(".update");
var elUpdateIco = elUpdate.querySelector('i');
var elWriterClose = elWriter.querySelector(".close");
var codemirror = CodeMi