jquery add multiple class to element code example

Example 1: jquery select element with two classes

$('.class1.class2') // select element that has both class1 and class2

Example 2: jquery add multiple attribute to element by class

$(myObj).attr({"data-test-1": num1, "data-test-2": num2});

Example 3: jquery add multiple classes

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>addClass demo</title>
  <style>
  p {
    margin: 8px;
    font-size: 16px;
  }
  .selected {
    color: red;
  }
  .highlight {
    background: yellow;
  }
  </style>
  <script src="https://code.jquery.com/jquery-3.4.1.js"></script>
</head>
<body>
 
<p>Hello</p>
<p>and</p>
<p>Goodbye</p>
 
<script>
$( "p" ).last().addClass( "selected highlight" );
</script>
 
</body>
</html>

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Javascript Example

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