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\!h Make a div with class name 'preloader'
  
jQuery(window).load(function() {
  jQuery(".preloader").fadeOut(500);
});

 //it will work for jquery below 3.0

  \!h Make a div with class name 'preloader'
  
  $(window).on("load", function (e) {
    $('.preloader').fadeOut(500);
  })
  
  //it will work for jquery 3.0 and above