jQuery实现的下雪动画效果示例【附源码下载】

罗惠东

2018-02-02

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：

jQuery实现的下雪动画效果示例【附源码下载】