I found the source of the page (How to add a custom right-click menu to a webpage?) about "How to add a custom right-click menu to a webpage"
There is no functionality to hide the menu.
How do I hide the menu?
$(function() {
  
  var $contextMenu = $("#contextMenu");
  
  $("body").on("contextmenu", "table tr", function(e) {
    $contextMenu.css({
      display: "block",
      left: e.pageX,
      top: e.pageY
    });
    return false;
  });
  
  $contextMenu.on("click", "a", function() {
     $contextMenu.hide();
  });
});#contextMenu {
  position: absolute;
  display: none;
}<!DOCTYPE html>
<html>
<head>
  <script src="http://code.jquery.com/jquery.min.js"></script>
  <link href="http://getbootstrap.com/dist/css/bootstrap.css" rel="stylesheet" type="text/css" />
  <script src="http://getbootstrap.com/dist/js/bootstrap.js"></script>
  <link href="http://getbootstrap.com/2.3.2/assets/css/bootstrap-responsive.css" rel="stylesheet" type="text/css" />
  <meta charset=utf-8 />
  <title>JS Bin</title>
</head>
<body>
  <table id="mt" class="table">
    <thead>
      <tr>
        <th>#</th>
        <th>First Name</th>
        <th>Last Name</th>
        <th>Username</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>1</td>
        <td>Mark</td>
        <td>Otto</td>
        <td>@mdo</td>
      </tr>
      <tr>
        <td>2</td>
        <td>Jacob</td>
        <td>Thornton</td>
        <td>@fat</td>
      </tr>
      <tr>
        <td>3</td>
        <td>Larry</td>
        <td>the Bird</td>
        <td>@twitter</td>
      </tr>
    </tbody>
  </table>
  <div id="contextMenu" class="dropdown clearfix">
    <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu" style="display:block;position:static;margin-bottom:5px;">
      <li><a tabindex="-1" href="#">Action</a>
      </li>
      <li><a tabindex="-1" href="#">Another action</a>
      </li>
      <li><a tabindex="-1" href="#">Something else here</a>
      </li>
      <li class="divider"></li>
      <li><a tabindex="-1" href="#">Separated link</a>
      </li>
    </ul>
  </div>
</body>
</html>Thanks!
 
     
     
    