jQuery实现的下雪动画效果示例【附源码下载】

程序员文章站 2022-05-03 09:27:28

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：

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】