jQuery实现的下雪动画效果示例【附源码下载】

本文实例讲述了jQuery实现的下雪动画效果。分享给大家供大家参考，具体如下：

html部分：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"><html xmlns="http://www.w3.org/1999/xhtml">  <head>    <meta name="viewport"      content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes" />    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>    <!-- snow -->    <script src="js/jquery.snow.js"></script>  </head>  <body>    <div id="content-wrapper">     <div class="inner clearfix">      <section id="main-content">       <img src="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 http://workshop.rs * * @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 id="flake" />').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：