Disable selection on Browser using JS

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1.Disable selection on Browser using JS
    

window.onload= function()  
{
disableSelection(document.body)
}
functiondisableSelection(target){
if (typeof target.onselectstart!=“undefined”) //IE 
        target.onselectstart=function(){return false}
else if (typeof target.style.MozUserSelect!=“undefined”)//Firefox 
        target.style.MozUserSelect=“none”
else //All other ie: Opera
        target.onmousedown=function(){return false}
target.style.cursor = “default”
}