<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> <title></title> <style type="text/css"> .test div{ width: 500px;height: 500px;} #aa{ height: auto;} </style> <script src="Scripts/jquery-1.10.2.min.js"></script> <script type="text/javascript"> (function ($, window) { var $window = $(window); $.fn.lazyevent = function (options) { var elements = this; var settings = { threshold: 0, event: "scroll", container: window, skip_invisible: true, fn: null, data: null }; function update() { elements.each(function () { var $this = $(this); if (settings.skip_invisible && !$this.is(":visible")) { return; } if (inviewport(this, settings)) { $this.trigger("fire"); } }); } if (options) { $.extend(settings, options); } var $container = (settings.container === undefined || settings.container === window) ? $window : $(settings.container); if (0 === settings.event.indexOf("scroll")) { $container.bind(settings.event, function (event) { return update(); }); } this.each(function () { var self = this; var $self = $(self); self.fired = false; $self.one("fire", function () { if (!this.fired) { if (settings.fn) { settings.fn.call(self, settings.data); } self.fired = true; var temp = $.grep(elements, function (element) { return !element.fired; }); elements = $(temp); } }); if (0 !== settings.event.indexOf("scroll")) { $self.bind(settings.event, function (event) { if (!self.fired) { $self.trigger("fire"); } }); } }); $window.bind("resize", function (event) { update(); }); var belowthefold = function (element, settings) { var fold; if (settings.container === undefined || settings.container === window) { fold = $window.height() + $window.scrollTop(); } else { fold = $container.offset().top + $container.height(); } return fold <= $(element).offset().top - settings.threshold; }; var rightoffold = function (element, settings) { var fold; if (settings.container === undefined || settings.container === window) { fold = $window.width() + $window.scrollLeft(); } else { fold = $container.offset().left + $container.width(); } return fold <= $(element).offset().left - settings.threshold; }; var abovethetop = function (element, settings) { var fold; if (settings.container === undefined || settings.container === window) { fold = $window.scrollTop(); } else { fold = $container.offset().top; } return fold >= $(element).offset().top + settings.threshold + $(element).height(); }; var leftofbegin = function (element, settings) { var fold; if (settings.container === undefined || settings.container === window) { fold = $window.scrollLeft(); } else { fold = $container.offset().left; } return fold >= $(element).offset().left + settings.threshold + $(element).width(); }; var inviewport = function (element, settings) { return !abovethetop(element, settings) && !leftofbegin(element, settings) && !belowthefold(element, settings) && !rightoffold(element, settings); }; update(); return this; }; })(jQuery, window); </script> <script type="text/javascript"> $(function () { $("#aa").lazyevent({ data: "hello word", fn: function (data) { var html = $(this).html(); alert(data + ":" + html); } }); }); </script> </head> <body> <div style="height: 200px"> </div> <div class="test"> <div style="background-color: Green" >Green</div> <div style="background-color: Lime">Lime</div> <div style="background-color: Maroon; display:none">Maroon</div> <div style="background-color: Olive">Olive</div> <div style="background-color: Red; display: none">Red</div> <div style="background-color: ButtonFace">ButtonFace</div> <div style="background-color: Aqua">Aqua</div> <div style="background-color: AppWorkspace; height:auto;" id="aa" >AppWorkspace</div> </div> </body> </html>
压缩后的js代码：
<script type="text/javascript"> (function (a, c) { var b = a(c); a.fn.lazyevent = function (j) { var g = this; var l = { threshold: 0, event: "scroll", container: c, skip_invisible: true, fn: null, data: null }; function m() { var n = 0; g.each(function () { var o = a(this); if (l.skip_invisible && !o.is(":visible")) { return } if (h(this, l)) { o.trigger("fire") } }) } if (j) { a.extend(l, j) } var d = (l.container === undefined || l.container === c) ? b : a(l.container); if (0 === l.event.indexOf("scroll")) { d.bind(l.event, function (n) { return m() }) } this.each(function () { var o = this; var n = a(o); o.fired = false; n.one("fire", function () { if (!this.fired) { if (l.fn) { l.fn.call(o, l.data) } o.fired = true; var p = a.grep(g, function (q) { return !q.fired }); g = a(p) } }); if (0 !== l.event.indexOf("scroll")) { n.bind(l.event, function (p) { if (!o.fired) { n.trigger("fire") } }) } }); b.bind("resize", function (n) { m() }); var f = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.height() + b.scrollTop() } else { o = d.offset().top + d.height() } return o <= a(n).offset().top - p.threshold }; var k = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.width() + b.scrollLeft() } else { o = d.offset().left + d.width() } return o <= a(n).offset().left - p.threshold }; var e = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.scrollTop() } else { o = d.offset().top } return o >= a(n).offset().top + p.threshold + a(n).height() }; var i = function (n, p) { var o; if (p.container === undefined || p.container === c) { o = b.scrollLeft() } else { o = d.offset().left } return o >= a(n).offset().left + p.threshold + a(n).width() }; var h = function (n, o) { return !e(n, o) && !i(n, o) && !f(n, o) && !k(n, o) }; m(); return this } })(jQuery, window); </script>