jquery雪花飘落特效

<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script type="text/javascript">(function($){$.fn.snow = function(options){var $flake = $('<div id="snowbox" />').css({'position': 'absolute','z-index':'9999', 'top': '-50px'}).html('❄'),documentHeight = $(document).height(),documentWidth= $(document).width(),defaults = {minSize: 10,maxSize: 20,newOn: 1000,flakeColor: "#FFFFFF" /* 此处可以定义雪花颜色，若要白色可以改为#FFFFFF */},options= $.extend({}, defaults, options);var interval= setInterval( function(){var startPositionLeft = Math.random() * documentWidth - 100,startOpacity = 0.5 + Math.random(),sizeFlake = options.minSize + Math.random() * options.maxSize,endPositionTop = documentHeight - 200,endPositionLeft = startPositionLeft - 500 + Math.random() * 500,durationFall = documentHeight * 10 + Math.random() * 5000;$flake.clone().appendTo('body').css({left: startPositionLeft,opacity: startOpacity,'font-size': sizeFlake,color: options.flakeColor}).animate({top: endPositionTop,left: endPositionLeft,opacity: 0.2},durationFall,'linear',function(){$(this).remove()});}, options.newOn); };})(jQuery);$(function(){ $.fn.snow({ minSize: 5, /* 定义雪花最小尺寸 */ maxSize: 20,/* 定义雪花最大尺寸 */ newOn: 300 /* 定义密集程度，数字越小越密集 */ });});</script><!-- end 自定义代码 -->

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