Disable browser back button using javascript

 Avoid users to navigate previous page by clicking browser's back button.

Use anyone script. 

window.history.forward(0);

<script language="JavaScript">

javascript:window.history.forward(1);

script>
 
 
 
 
 

<script type = "text/javascript" >

   function preventBack(){window.history.forward();}

    setTimeout("preventBack()", 0);

    window.onunload=function(){null};

script>