让你的博客飘雪花超出屏幕依然看得见

(function($){
$.fn.snow=function(options){
var $flake=$('<div />')
.css({
'position':'fixed',//'absolute',
'top':'-50px',
'z-index':'1000'
})
.html('&#10052;');
var documentHeight=document.documentElement.clientHeight;//$(document).height();
var documentWidth=$(document).width();
var defaults={minSize:10,maxSize:20,newOn:500,flakeColor:"#FFFFFF"};
var options=$.extend({},defaults,options);
var interval=setInterval(function(){
var startPositionLeft=Math.random()*documentWidth-100;
var startOpacity=0.5+Math.random();
var sizeFlake=options.minSize+Math.random()*options.maxSize;
var endPositionTop=documentHeight-40;
var endPositionLeft=startPositionLeft-100+Math.random()*200;
var 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(){
$(this).remove();
});
},options.newOn);//interval End
};//$.fn.snow End
})(jQuery);
$.fn.snow({ minSize: 10, maxSize: 60, newOn: 800, flakeColor: '#ccc'});