CP_ChangeBgColor

Change Background color - pure JavaScript

by bryiantan

HTML

<body onload = "go()">
  <div class = "elem"></div>
  <button onclick = "go()">click to change bgcolor</button>
</body>

CSS

div {
  width: 100px;
  height: 100px;
  border: 2px solid black;
  background-color: green;
}

JavaScript

function go() {
	//document.getElementsByClassName("elem")[1].style.backgroundColor = "red";
  document.getElementsByClassName("elem")[0].style.backgroundColor = "red";
}