/*吴慎敏*//**三超控件--吴慎敏**//**用法超简单-吴慎敏*--*//**超级省带宽-邮箱-吴*-慎@!敏*//**超快客户端加载速度(吴@慎$敏)**/(function ($) {$.fn.lazyload = function (options) {var settings = {threshold: 0,failurelimit: 0,event: "scroll",effect: "show",container: window};if (options) {$.extend(settings, options);}var elements = this;if ("scroll" == settings.event) {$(settings.container).bind("scroll", function(event) {var counter = 0;elements.each(function() {if ($.abovethetop(this, settings) ||$.leftofbegin(this, settings)) {self.loaded = false;}else if (!$.belowthefold(this, settings) &&!$.rightoffold(this, settings)) {self.loaded = false;$(this).trigger("appear");}else {self.loaded = true;if (counter++ > settings.failurelimit) {return false;}}});var temp = $.grep(elements, function(element) {return !element.loaded;});elements = $(temp);});}this.each(function() {var self = this;if (settings.placeholder) {$(self).attr("src", settings.placeholder);} $(self).one("appear", function() {if (!this.loaded) {$("<img />").bind("load", function() {$(self).hide().attr("src", $(self).attr("original"))[settings.effect](settings.effectspeed);self.loaded = true;}).attr("src", $(self).attr("original"));};});if ("scroll" != settings.event) {$(self).bind(settings.event, function(event) {if (!self.loaded) {$(self).trigger("appear");}});}});$(settings.container).trigger(settings.event);return this;};$.belowthefold = function(element, settings) {if (settings.container === undefined || settings.container === window) {var fold = $(window).height() + $(window).scrollTop();} else {var fold = $(settings.container).offset().top + $(settings.container).height();}return fold <= $(element).offset().top - settings.threshold;};$.rightoffold = function(element, settings) {if (settings.container === undefined || settings.container === window) {var fold = $(window).width() + $(window).scrollLeft();} else {var fold = $(settings.container).offset().left + $(settings.container).width();}return fold <= $(element).offset().left - settings.threshold;};$.abovethetop = function(element, settings) {if (settings.container === undefined || settings.container === window) {var fold = $(window).scrollTop();} else {var fold = $(settings.container).offset().top;}return fold >= $(element).offset().top + settings.threshold + $(element).height();};$.leftofbegin = function(element, settings) {if (settings.container === undefined || settings.container === window) {var fold = $(window).scrollLeft();} else {var fold = $(settings.container).offset().left;}return fold >= $(element).offset().left + settings.threshold + $(element).width();};$.extend($.expr[':'], {"below-the-fold": "$.belowthefold(a, {threshold : 0, container: window})","above-the-fold": "!$.belowthefold(a, {threshold : 0, container: window})","right-of-fold": "$.rightoffold(a, {threshold : 0, container: window})","left-of-fold": "!$.rightoffold(a, {threshold : 0, container: window})"});})(jQuery);