jQuery defines the method to dynamically switch the effect of the background

This example shows how jQuery defines the effect of dynamic background switching. Share with you for your reference. The details are as follows:

With the jQuery plugin below, you can place the image in an array and tell jQuery where the image needs to be rotated in the background

(function($){
 var defaultSettings;
 var divfg, divbg;
 var fadeInterval;
 var fqTimer;
 var currImg = 0;
 var displImg = 0;
 var running = false;
 // Setup settings and initialize the plugin
 $.fn.bgFade = function(settings, callback){
  defaultSettings = $.extend({
   frequency: 5000,
   speed: 10,
   images: [],
   position: "center center",
   fgz: 1,
   bgz: 0
  }, settings);
  var c = 0;
  $(this).each(function(){
   if(c == 0) divfg = $(this);
   if(c == 1) divbg = $(this);
   c++;
  });
  setBackgrounds();
  if(typeof callback == "function"){
   callback();
  }
  return this;
 };
 // Start the fadder
 $.fn.start = function(){
  fqTimer = setTimeout(function(){
  nextFade()},defaultSettings.frequency
  );
  running = true;
  return this;
 };
 // Stop the fadder
 $.fn.stop = function(){
  clearInterval(fadeInterval);
  clearTimeout(fqTimer);
  running = false;
  return this;
 }
 // Get the current image info {array id, image url}
 $.current = function(){
  return {pos: displImg, url: defaultSettings.images[displImg]}
 }
 // Set the first two backgrounds
 function setBackgrounds(){
  image1 = defaultSettings.images[0];
  image2 = defaultSettings.images[1];
  divfg.css({
   backgroundImage: "url('"+image1+"')",
   zIndex: defaultSettings.fgz,
   backgroundPosition: defaultSettings.postion
  });
  divbg.css({
   backgroundImage: "url('"+image2+"')",
   zIndex: defaultSettings.bgz,
   backgroundPosition: defaultSettings.postion
  });
  currImg = 1;
  displImg = 0;
 }
 // Set the next background after a fade completes
 function setNextBackground(){
  next = arrayNext();
  image = defaultSettings.images[next];
  divbg.css({
   backgroundImage: "url('"+image+"')"
  });
  setTimeout(function(){nextFade()}, defaultSettings.frequency);
 }
 // Run a fade
 function nextFade(){
  fadeInterval = setInterval(function(){fadeIt()}, 30);
 }
 // Decrement the opacity of the div
 function fadeIt(){
  if(divfg.css("opacity") == ''){
   op = 1;
  }else{
   op = divfg.css("opacity");
  }
  op -= ((1000 * defaultSettings.speed) / 30) * 0.0001;
  divfg.css("opacity", op);
  if(op <= 0){
   bg = divbg;
   bgimg = divbg.css("background-image");
   divfg.css("opacity", "1");
   divfg.css("background-image", bgimg);
   clearInterval(fadeInterval);
   setNextBackground();
   displImg = arrayCurrent();
  }
 }
 // Get the next item in the array
 function arrayNext(){
  var next = currImg + 1;
  if(next >= defaultSettings.images.length){
   next = 0;
  }
  currImg = next;
  return next;
 }
 // Get the current item in the array
 function arrayCurrent(){
  var cur = currImg - 1;
  if(cur < 0)
   cur = defaultSettings.images.length - 1;
  return cur;
 }
})(jQuery);

I hope this article has been helpful to your jQuery programming.