1021字节javascript写成的3D圣诞树
demo地址：http://js1k.com/2010-xmas/demo/856 （非Chrome浏览器会非常卡）
源码如下：
<!doctype html>
<html>
<head>
<title>JS1k, 1k demo submission [856]</title>
<meta charset="utf-8" />
</head>
<body>
<canvas id="c"></canvas>
<script>
var b = document.body;
var c = document.getElementsByTagName('canvas')[0];
var a = c.getContext('2d');
document.body.clientWidth; // fix bug in chrome.
</script>
<script>
// start of submission //
M=Math;Q=M.random;J=[];U=16;T=M.sin;E=M.sqrt;for(O=k=0;x=z=j=i=k<200;)with(M[k]=k?c.cloneNode(0):c){width=height=k?32:W=446;with(getContext('2d'))if(k>10|!k)for(font='60px Impact',V='rgba(';I=i*U,fillStyle=k?k==13?V+'205,205,215,.15)':V+(147+I)+','+(k%2?128+I:0)+','+I+',.5)':'%23cca',i<7;)beginPath(fill(arc(U-i/3,24-i/2,k==13?4-(i++)/2:8-i++,0,M.PI*2,1)));else for(;x=T(i),y=Q()*2-1,D=x*x+y*y,B=E(D-x/.9-1.5*y+1),R=67*(B+1)*(L=k/9+.8)>>1,i++<W;)if(D<1)beginPath(strokeStyle=V+R+','+(R+B*L>>0)+',40,.1)'),moveTo(U+x*8,U+y*8),lineTo(U+x*U,U+y*U),stroke();for(y=H=k+E(k++)*25,R=Q()*W;P=3,j<H;)J[O++]=[x+=T(R)*P+Q()*6-3,y+=Q()*U-8,z+=T(R-11)*P+Q()*6-3,j/H*20+((j+=U)>H&Q()>.8?Q(P=9)*4:0)>>1]}setInterval(function G(m,l){A=T(D-11);if(l)return(m[2]-l[2])*A+(l[0]-m[0])*T(D);a.clearRect(0,0,W,W);J.sort(G);for(i=0;L=J[i++];a.drawImage(M[L[3]+1],207+L[0]*A+L[2]*T(D)>>0,L[1]>>1)){if(i==2e3)a.fillText('Merry Xmas!',U,345);if(!(i%7))a.drawImage(M[13],((157*(i*i)+T(D*5+i*i)*5)%W)>>0,((113*i+(D*i)/60)%(290+i/99))>>0);}D+=.02},1)
// end of submission //
</script>
</body>
</html>
作者技术解释：
http://www.romancortes.com/blog/how-i-did-the-1kb-christmas-tree/
在chrome中按CT+SH+i
<frame marginwidth="0" marginheight="0" frameborder="0" src="javascript:'<!doctype html>/n<html>/n/t<head>/n/t/t<title>JS1k, 1k demo submission [856]</title>/n/t/t<meta charset="utf-8" />/n/t</head>/n/t<body>/n/t/t<canvas id="c"></canvas>/n/t/t<script>/n/t/t/tvar b = document.body;/n/t/t/tvar c = document.getElementsByTagName(/'canvas/')[0];/n/t/t/tvar a = c.getContext(/'2d/');/n/t/t/tdocument.body.clientWidth; // fix bug in chrome./n/t/t</script>/n/t/t<script>/n// start of submission ///nM=Math;Q=M.random;J=[];U=16;T=M.sin;E=M.sqrt;for(O=k=0;x=z=j=i=k<200;)with(M[k]=k%3Fc.cloneNode(0):c){width=height=k%3F32:W=446;with(getContext(/'2d/'))if(k>10|!k)for(font=/'60px Impact/',V=/'rgba(/';I=i*U,fillStyle=k%3Fk==13%3FV+/'205,205,215,.15)/':V+(147+I)+/',/'+(k%252%3F128+I:0)+/',/'+I+/',.5)/':/'%23cca/',i<7;)beginPath(fill(arc(U-i/3,24-i/2,k==13%3F4-(i++)/2:8-i++,0,M.PI*2,1)));else for(;x=T(i),y=Q()*2-1,D=x*x+y*y,B=E(D-x/.9-1.5*y+1),R=67*(B+1)*(L=k/9+.8)>>1,i++<W;)if(D<1)beginPath(strokeStyle=V+R+/',/'+(R+B*L>>0)+/',40,.1)/'),moveTo(U+x*8,U+y*8),lineTo(U+x*U,U+y*U),stroke();for(y=H=k+E(k++)*25,R=Q()*W;P=3,j<H;)J[O++]=[x+=T(R)*P+Q()*6-3,y+=Q()*U-8,z+=T(R-11)*P+Q()*6-3,j/H*20+((j+=U)>H&Q()>.8%3FQ(P=9)*4:0)>>1]}setInterval(function G(m,l){A=T(D-11);if(l)return(m[2]-l[2])*A+(l[0]-m[0])*T(D);a.clearRect(0,0,W,W);J.sort(G);for(i=0;L=J[i++];a.drawImage(M[L[3]+1],207+L[0]*A+L[2]*T(D)>>0,L[1]>>1)){if(i==2e3)a.fillText(/'Merry Christmas!/',U,345);if(!(i%257))a.drawImage(M[13],((157*(i*i)+T(D*5+i*i)*5)%25W)>>0,((113*i+(D*i)/60)%25(290+i/99))>>0);}D+=.02},1)/n// end of submission ///n/t/t</script>/n/t</body>/n</html>'" noresize="">
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