How to disable browser back button using JavaScript?

In this article, how to disable browser back button using JavaScript?

 

Using window.history.forward()

 

<script type = "text/javascript" >  
    function preventBack() { window.history.forward(); }  
    setTimeout("preventBack()", 0);  
    window.onunload = function () { null };  
</script>

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How to disable browser back button using JavaScript?
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