1. [代码][HTML]代码
<a href="javascript:void(function(){var d = document,a = 'setAttribute',s = d.createElement('script');s[a]('type','text/javascript');s[a]('src','http://www.veryued.org/wp-content/themes/google_snow.js');d.head.appendChild(s);})();">下雪</a>
2. [代码][JavaScript]代码
(function(){
if(window.zythumsgooglesnowloaded) return false;
function oneCircle(ct,cw,ch,pw,_pw,ph,_ph){
var rw = (_pw+(pw-_pw)*Math.random())*cw,
rh = (_ph+(ph-_ph)*Math.random())*ch,
ra = 0.5*Math.random(),
rr = 50+cw/10*Math.random();
ct.globalCompositeOperation = 'source-over';
var g = ct.createRadialGradient(rw, rh, 0, rw, rh, rr);
g.addColorStop(0,'rgba(240,240,240,'+ra+')');
g.addColorStop(1,'rgba(240,240,240,0)');
ct.fillStyle = g;
ct.fillRect(0, 0, cw, ch);
ct.fill();
}
function draw(ct){
var pointerArr = [];
this.dPointer = function(x,y){
pointerArr.push({x:x,y:y});
_draw(0);
}
this.dLine = function(x,y){
pointerArr.push({x:x,y:y});
_draw(0);
}
this.stop = function(){
pointerArr.push(false);
}
var _draw = function(c){
ct.globalCompositeOperation = 'destination-out';
ct.lineWidth = 60;
ct.lineCap = ct.lineJoin = "round";
ct.beginPath();
ct.moveTo(pointerArr[c].x,pointerArr[c].y);
while(pointerArr[++c]){
ct.lineTo(pointerArr[c].x,pointerArr[c].y);
}
ct.stroke();
ct.closePath();
if(pointerArr[c] == undefined) return false;
_draw(++c);
}
}
var d = document.createElement('div'),
ca = document.createElement('canvas'),
w = 0;h = 0;
document.body.appendChild(d);
d.appendChild(ca);
d.style.cssText += ';position:fixed;top:0;left:0;bottom:0;right:0;z-index:100001;';
w = d.offsetWidth;h = d.offsetHeight;
ca.setAttribute('width',w);
ca.setAttribute('height',h);
ca.onselectstart = function(){return false};
ca.style.cursor = 'pointer';
ct = ca.getContext('2d');
//forgs
forgFinished = false;
setTimeout(function(){
(function(){
var loopContent = 100,
loop = function(){
oneCircle(ct,w,h,1,0,0.05,-0.1);
if(loopContent--) setTimeout(loop,50);
}
loop();
})();
},2000)
setTimeout(function(){
(function(){
var loopContent = 80,
loop = function(){
oneCircle(ct,w,h,1.1,0.95,1,0);
if(loopContent--) setTimeout(loop,50);
}
loop();
})();
(function(){
var loopContent = 80,
loop = function(){
oneCircle(ct,w,h,0.05,-0.1,1,0);
if(loopContent--) setTimeout(loop,50);
}
loop();
})();
(function(){
var loopContent = 80,
loop = function(){
oneCircle(ct,w,h,1,0,1.1,0.95);
if(loopContent--) setTimeout(loop,50);
}
loop();
})();
},4000);
setTimeout(function(){
(function(){
var loopContent = 50,
loop = function(){
oneCircle(ct,w,h,1,0,0.3,0.05);
if(loopContent--) setTimeout(loop,40);
}
loop();
})();
(function(){
var loopContent = 50,
loop = function(){
oneCircle(ct,w,h,0.95,0.7,1,0);
if(loopContent--) setTimeout(loop,40);
}
loop();
})();
(function(){
var loopContent = 50,
loop = function(){
oneCircle(ct,w,h,0.3,0.05,1,0);
if(loopContent--) setTimeout(loop,40);
}
loop();
})();
(function(){
var loopContent = 50,
loop = function(){
oneCircle(ct,w,h,1,0,0.95,0.7);
if(loopContent--) setTimeout(loop,40);
}
loop();
})();
},6000);
setTimeout(function(){
(function(){
var loopContent = 50,
loop = function(){
oneCircle(ct,w,h,1,0,1,0);
if(loopContent--) setTimeout(loop,20);
}
loop();
})();
forgFinished = true;
//ct.save();
},7000);
//draw;
var dr = new draw(ct);
var moveFlag = false;
document.addEventListener('mousedown',function(e){
if(forgFinished){
dr.dPointer(e.clientX,e.clientY);
moveFlag = true;
}
},false);
document.addEventListener('mousemove',function(e){
if(moveFlag) dr.dLine(e.clientX,e.clientY)
},false);http://www.huiyi8.com/clxgt/
document.addEventListener('mouseup',function(e){
dr.stop(e.clientX,e.clientY)
moveFlag = false;
},false);窗帘效果图
document.addEventListener('touchstart',function(e){
dr.dPointer(e.clientX,e.clientY);
moveFlag = true;
},false);
document.addEventListener('touchmove',function(e){
if(moveFlag) dr.dLine(e.clientX,e.clientY)
},false);
document.addEventListener('touchend',function(e){
dr.stop(e.clientX,e.clientY)
moveFlag = false;
},false);
//snow
var sd = document.createElement('div');
document.body.appendChild(sd);
sd.style.cssText += ';position:fixed;top:0;left:0;right:0;bottom:0;z-index:100000;overflow:hidden;';
var ss = [];
var limit = 0;
var stime = setInterval(function(){
if(limit++ == 5){
limit = 0;
var ns = document.createElement('div');
ns.innerHTML = '\u2745';
ns.style.cssText += ';position:absolute;top:-2px;color:#333;opacity:0.8;';
//-webkit-transition:top 0.05 linear;-webkit-transition:left 0.05 linear;-moz-transition:top 0.05 linear;-moz-transition:left 0.05 linear;-o-transition:top 0.05 linear;-o-transition:left 0.05 linear;
ns.ztop = -2;
ns._ztop = 2+Math.random()*5;
ns.zleft = Math.random()*sd.offsetWidth;
ns._zleft = Math.random()<0.5? Math.random() : Math.random()*(-1);
ns.style.fontSize = 16*Math.random()+'px';
ns.style.opacity = 0.5+Math.random()*0.5;
ns.style.left = ns.zleft+'px';
sd.appendChild(ns);
ss.push(ns);
}
for(var i=0;i<ss.length;i++){
ss[i].ztop += ss[i]._ztop;
ss[i].zleft += ss[i]._zleft;
if(ss[i].ztop > sd.offsetHeight){
sd.removeChild(ss[i]);
ss.splice(i,1);
}else{
ss[i].style.top = ss[i].ztop+'px';
ss[i].style.left = ss[i].zleft+'px';
}
}
},20);
//close
setTimeout(function(){
var close = document.createElement('div');
close.innerHTML = '{Stop snowing.}';
close.style.cssText += ';cursor:pointer;text-shadow:0 0 5px #fff;color#aaa;font-size:16px;position:fixed;top:20px;right:20px;font-family:arial,sans-erif;z-index:100002';
document.body.appendChild(close);
close.addEventListener('click',function(){
clearInterval(stime);
document.body.removeChild(d);
document.body.removeChild(sd);
document.body.removeChild(close);
window.zythumsgooglesnowloaded = undefined;
},false);
},5000);
window.zythumsgooglesnowloaded = true;
})();