1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43

<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 : 6,
 maxSize : 10,
 newOn : 1000,
 flakeColor : "#FFFFFF" /* 此处可以定义雪花颜色 */
 },
 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: 800 /* 定义密集程度，数字越小越密集 */
 });
});
</script>