<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes" /> <script src="https://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script> <!-- snow --> <script src="https://www.jb51.net/js/jquery.snow.js"></script> </head> <body> <div> <div> <section> <img src="https://www.jb51.net/images/merry_christmasA.jpg" alt="chrismas"> </section> </div> </div> <script> $(document).ready( function(){ $.fn.snow( { minSize: 2, maxSize: 150, newOn: 200, flakeColor: '#FFFFFF' } ); }); </script> </body> </html>
jquery.snow.js:
/** * jquery.snow - jQuery Snow Effect Plugin * * Available under MIT licence * * @version 1 (21. Jan 2012) * @author Ivan Lazarevic * @requires jQuery * @see * * @params minSize - min size of snowflake, 10 by default * @params maxSize - max size of snowflake, 20 by default * @params newOn - frequency in ms of appearing of new snowflake, 500 by default * @params flakeColor - color of snowflake, #FFFFFF by default * @example $.fn.snow({ maxSize: 200, newOn: 1000 }); */ (function($){ $.fn.snow = function(options){ var $flake = $('<div />').css({'position': 'absolute', 'top': '-50px'}).html('❄'), documentHeight = $(document).height(), documentWidth = $(document).width(), defaults = { minSize : 10, maxSize : 20, newOn : 500, flakeColor : "#FFFFFF" }, options = $.extend({}, defaults, options); //setInterval-setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。 //开始一个周期-开始添加雪花 var interval = setInterval( function(){ var startPositionLeft = Math.random() * documentWidth - 100, startOpacity = 0.5 + Math.random(), sizeFlake = options.minSize + Math.random() * options.maxSize, endPositionTop = documentHeight - 40, endPositionLeft = startPositionLeft - 100 + Math.random() * 200, durationFall = documentHeight * 10 + Math.random() * 5000; $flake .clone() .appendTo('body') .css( { left: startPositionLeft, opacity: startOpacity, 'font-size': sizeFlake, color: options.flakeColor } ) .animate(//增加雪花动态效果 { top: endPositionTop, left: endPositionLeft, opacity: 0.2 }, durationFall, 'linear', function() { $(this).remove() } ); }, options.newOn); //结束周期-停止添加雪花 setTimeout(function(){ window.clearInterval(interval); },5000); }; })(jQuery);
不需要css样式
主要用到：setInterval-setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。& animate动画
运行效果：
附：完整实例代码点击此处本站下载。
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