Disable back button

back disable
———
<script type=”text/javascript” language=”JavaScript”>
function noBack(){
window.history.forward();
}
noBack();
window.onload=noBack;
window.onpageshow=function(evt){
try{
if(event.persisted)
noBack();
}
catch(e){
}
}
window.onunload=function(){void(0)}
</script>

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