title: `The function $(Window) is undefined` err in jquery
body: <p>I used the <code>Jquery 1.9.1</code> and used the code to fire when browser window will get closed as </p>
  
  <p>My  <code>JSP</code> will be , </p>
  
  <p><img src="https://i.stack.imgur.com/oS9a7.png" alt="enter image description here"></p>
  
  <p>But this shows a <code>red underline error</code> like show in picture in  <code>eclipse</code>.</p>
  
  <p>I don't know why I am getting this error.Can any one help me to solve this.</p>
  
  <p>Don't hesitate to ask any question.</p>
  
  <p>Good answers are definitely appreciated.</p>