雪花js特效
先引入jquery，然后放上js代码就行了
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.1.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: "#AFDAEF" /* 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: 50,
/* 定义雪花最大尺寸 */
newOn: 100 /* 定义密集程度，数字越小越密集 */
});
});
</script>
<title></title>
</head>
<body>
</body>
</html>
效果如图：
