Javascript DOM HTML Element getElementsByClassName() Method get second <paragraph>

Introduction

Change the background color of the second element with class="child" inside of a <div> element:

Click the button to add a background color to the second p element with class=child inside the div element.

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<!DOCTYPE html>
<html>
<head>
<style>
div {/*from  ww w  .j av a  2  s .c  o  m*/
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<div id="myDIV">
  <p class="child">First p element with class="child" in a div (index 0).</p>
  <p class="child">Second p element with class="child" in a div (index 1).</p>
  <p class="child">Third p element with class="child" in a div (index 2).</p>
</div>
<button onclick="myFunction()">Test</button>
<script>
function myFunction() {
  var x = document.getElementById("myDIV");
  x.getElementsByClassName("child")[1].style.backgroundColor = "red";
}
</script>

</body>
</html>



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