Update Page body class after new page load about ajaxify

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I have resolved this issue. Here is my solution

                // Update the page body class
                var curpage = window.location.pathname.split('/').pop(),
                    homepage = ''
                   // Create a conditional to check if the page loaded is the home page
                if (curpage == homepage){ 
                    $body.removeClass().addClass('home');
                                   // the home class is arbitrary and you could use whatever name for your home page
                }else{
                    $body.removeClass().addClass(curpage);
                                   // be sure to always remove any pre existing class value before adding the new one.
                }