某個 div id 下的 div 加都入 class

<div id = "container"> <div id = "alot">1</div> <div id = "of">2</div> <div id = "random">3</div> <div id = "ids">4</div> </div> <script type="text/javascript"> var everyChild = document.querySelectorAll("#container div"); alert(everyChild.length); for (var i = 0; i<everyChild.length; i++) { everyChild[i].classList.add("anything"); } </script>
參考來源：http://stackoverflow.com/questions/27629122/how-to-get-all-ids-inside-of-a-div-using-pure-javascript