js:
/* * Lazy Load - jQuery plugin for lazy loading images * * Copyright (c) 2007-2013 Mika Tuupola * * Licensed under the MIT license: * http://www.opensource.org/licenses/mit-license.php * * Project home: * http://www.appelsiini.net/projects/lazyload * * Version: 1.9.3 * */
(function($, window, document, undefined) { var $window = $(window);
$.fn.lazyload = function(options) { var elements = this; var $container; var settings = { threshold : 0, failure_limit : 0, event : "scroll", effect : "show", container : window, data_attribute : "original", skip_invisible : true, appear : null, load : null, placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" };
function update() { var counter = 0;
elements.each(function() { var $this = $(this); if (settings.skip_invisible && !$this.is(":visible")) { return; } if ($.abovethetop(this, settings) || $.leftofbegin(this, settings)) { /* Nothing. */ } else if (!$.belowthefold(this, settings) && !$.rightoffold(this, settings)) { $this.trigger("appear"); /* if we found an image we'll load, reset the counter */ counter = 0; } else { if (++counter > settings.failure_limit) { return false; } } });
}
if(options) { /* Maintain BC for a couple of versions. */ if (undefined !== options.failurelimit) { options.failure_limit = options.failurelimit; delete options.failurelimit; } if (undefined !== options.effectspeed) { options.effect_speed = options.effectspeed; delete options.effectspeed; }
$.extend(settings, options); }
/* Cache container as jQuery as object. */ $container = (settings.container === undefined || settings.container === window) ? $window : $(settings.container);
/* Fire one scroll event per scroll. Not one scroll event per image. */ if (0 === settings.event.indexOf("scroll")) { $container.bind(settings.event, function() { return update(); }); }
this.each(function() { var self = this; var $self = $(self);
self.loaded = false;
/* If no src attribute given use data:uri. */ if ($self.attr("src") === undefined || $self.attr("src") === false) { if ($self.is("img")) { $self.attr("src", settings.placeholder); } }
/* When appear is triggered load original image. */ $self.one("appear", function() { if (!this.loaded) { if (settings.appear) { var elements_left = elements.length; settings.appear.call(self, elements_left, settings); } $("<img />") .bind("load", function() {
var original = $self.attr("data-" + settings.data_attribute); $self.hide(); if ($self.is("img")) { $self.attr("src", original); } else { $self.css("background-image", "url('" + original + "')"); } $self[settings.effect](settings.effect_speed);
self.loaded = true;
/* Remove image from array so it is not looped next time. */ var temp = $.grep(elements, function(element) { return !element.loaded; }); elements = $(temp);
if (settings.load) { var elements_left = elements.length; settings.load.call(self, elements_left, settings); } }) .attr("src", $self.attr("data-" + settings.data_attribute)); } });
/* When wanted event is triggered load original image */ /* by triggering appear. */ if (0 !== settings.event.indexOf("scroll")) { $self.bind(settings.event, function() { if (!self.loaded) { $self.trigger("appear"); } }); } });
/* Check if something appears when window is resized. */ $window.bind("resize", function() { update(); });
/* With IOS5 force loading images when navigating with back button. */ /* Non optimal workaround. */ if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) { $window.bind("pageshow", function(event) { if (event.originalEvent && event.originalEvent.persisted) { elements.each(function() { $(this).trigger("appear"); }); } }); }
/* Force initial check if images should appear. */ $(document).ready(function() { update(); });
return this; };
/* Convenience methods in jQuery namespace. */ /* Use as $.belowthefold(element, {threshold : 100, container : window}) */
$.belowthefold = function(element, settings) { var fold;
if (settings.container === undefined || settings.container === window) { fold = (window.innerHeight ? window.innerHeight : $window.height()) + $window.scrollTop(); } else { fold = $(settings.container).offset().top + $(settings.container).height(); }
return fold <= $(element).offset().top - settings.threshold; };
$.rightoffold = function(element, settings) { var fold;
if (settings.container === undefined || settings.container === window) { fold = $window.width() + $window.scrollLeft(); } else { fold = $(settings.container).offset().left + $(settings.container).width(); }
return fold <= $(element).offset().left - settings.threshold; };
$.abovethetop = function(element, settings) { var fold;
if (settings.container === undefined || settings.container === window) { fold = $window.scrollTop(); } else { fold = $(settings.container).offset().top; }
return fold >= $(element).offset().top + settings.threshold + $(element).height(); };
$.leftofbegin = function(element, settings) { var fold;
if (settings.container === undefined || settings.container === window) { fold = $window.scrollLeft(); } else { fold = $(settings.container).offset().left; }
return fold >= $(element).offset().left + settings.threshold + $(element).width(); };
$.inviewport = function(element, settings) { return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) && !$.belowthefold(element, settings) && !$.abovethetop(element, settings); };
/* Custom selectors for your convenience. */ /* Use as $("img:below-the-fold").something() or */ /* $("img").filter(":below-the-fold").something() which is faster */
$.extend($.expr[":"], { "below-the-fold" : function(a) { return $.belowthefold(a, {threshold : 0}); }, "above-the-top" : function(a) { return !$.belowthefold(a, {threshold : 0}); }, "right-of-screen": function(a) { return $.rightoffold(a, {threshold : 0}); }, "left-of-screen" : function(a) { return !$.rightoffold(a, {threshold : 0}); }, "in-viewport" : function(a) { return $.inviewport(a, {threshold : 0}); }, /* Maintain BC for couple of versions. */ "above-the-fold" : function(a) { return !$.belowthefold(a, {threshold : 0}); }, "right-of-fold" : function(a) { return $.rightoffold(a, {threshold : 0}); }, "left-of-fold" : function(a) { return !$.rightoffold(a, {threshold : 0}); } });
})(jQuery, window, document);
html:
<!doctype html><html>
<head>
<meta charset="utf-8">
<title>Lazy Load Enabled</title>
<style> img { width: 800px; }
body { padding-bottom: 400px; } </style>
</head>
<body> <img class="lazy" data-original="images/1.jpg"> <img class="lazy" data-original="images/2.jpg"> <img class="lazy" data-original="images/3.jpg"> <img class="lazy" data-original="images/4.jpg"> <img class="lazy" data-original="images/5.jpg">
<button onclick="add()" style="position: fixed;bottom:0;">ADD</button>
<script src="js/jquery-1.8.2.min.js"></script>
<script src="js/jquery.lazyload.js"></script>
<script type="text/javascript" charset="utf-8"> $(function () {
lazyImg() }); function add() { $('body').append(`<img class="lazy" data-original="images/1.jpg" > <img class="lazy" data-original="images/2.jpg" > <img class="lazy" data-original="images/3.jpg" > <img class="lazy" data-original="images/4.jpg" > <img class="lazy" data-original="images/5.jpg" >`) lazyImg() } function lazyImg() { $("img.lazy:not([src])").lazyload({ effect: "fadeIn" });
} </script> </body>
</html> 标签：function,container,settings,self,fold,window,图片,好用,加载 From： https://www.cnblogs.com/mingluxy/p/17789526.html