Tryit Editor v2.9

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<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
  <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Close Alerts Via JavaScript</h2>
  <div class="alert alert-success" id="myAlert">
    <a href="tryit.asp-filename=trybs_ref_js_alert_js&stacked=h.html#" class="close">&times;</a>
    <strong>Success!</strong> This alert box could indicate a successful or positive action.
  </div>
</div>

<script>
$(document).ready(function(){
    $(".close").click(function(){
        $("#myAlert").alert("close");
    });
});
</script>

</body>
</html>