JavaScript雪景动画-优快云博客

下面这个场景也是由不到1KB的JavaScript代码生成。

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	<head>
		<title>踏雪练习</title>
		<meta charset="utf-8" />
	</head>
	<body>
		<canvas id="c"></canvas>
		<script>
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			var c = document.getElementsByTagName('canvas')[0];
			var a = c.getContext('2d');
			document.body.clientWidth; 
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		<script>for(p in a)a[p[0]+(p[6]||'')]=a[p];var M=Math,C=M.cos,S=M.sin,R=M.random,T=0,x=[],y=[],W=innerWidth,H=innerHeight,L=2047,Z=100,V=20,N=511,M=1337;c.width=W,b.style.overflow='hidden',b.style.margin='0px',c.height=H;g='globalAlpha';h='fillStyle';for(i=N;i--;){x[i]=L*R();y[i]=L*R()}setInterval(function(){T+=1/V;a[g]=0.2;function m(c){a[h]=c}m('#002');a.fc(0,0,W,H);a[g]=1;u=1;m('#ffc');for(i=0;i<N/3;++i){d=u=(u*M+1)&L;u=(u*M+1)&L;if(C(T*Z+i)<0.5){a.fx("\u2605",d,u)}}a.ba();a.arc(2*W/3,H/3,40,0,6.3,1);a.ca();a.fill();m('#cfc');B=H-V;for(j=0;j<5;++j){s=90-j*V;a.font=s+"px serif";F=1;for(i=0;i<W;i+=(F=(F*M)%Z)){a.fx("\u25B2",i-s/2,B+S(i)*30);}B-=s/2;}m('#eef');for(i=N;i--;){e=x[i];f=y[i];a.fx("\u06DE",e,f);y[i]=(f+1)%L;x[i]=(e+C(i+T)/3)%L}for(i=N*3;i--;){a.fc((x[i&N]+i)&L,(y[i&N]+i)&L,1,1)}for(i=W;i--;){d =Z+V*S(i/Z)+S(i/10);a.fc(i,H-d,1,d)}},50);

</script>
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