get id attribute jquery and add class code example

Example 1: how to add id in jquery

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>id demo</title>
  <style>
  div {
    width: 300px;
    float: left;
    padding: 2px;
    margin: 3px;
    background-color: #eee;
  }
  </style>
  <script src="https://code.jquery.com/jquery-3.5.0.js"></script>
</head>
<body>
 
<div id="myID.entry[0]">id="myID.entry[0]"</div>
<div id="myID.entry[1]">id="myID.entry[1]"</div>
<div id="myID.entry[2]">id="myID.entry[2]"</div>
 
<script>
$( "#myID\\.entry\\[1\\]" ).css( "border", "3px solid red" );
</script>
 
</body>
</html>

Example 2: how to add id in jquery

$( "li" ).add( document.getElementsByTagName( "p" )[ 0 ] )
  .css( "background-color", "red" );

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