snow2.js

/*
*CFS.Snow.js - snow.coolfishstudio.com
*Copyright (c) 20150225 v0.0.1 yuchunyu QQ:461836324
*/
var snow={info:{top:0,left:0,zIndex:500,number:70},down:function(){var f=window.innerWidth;var g=window.innerHeight;var d=document.createElement("canvas");d.style.position="fixed";d.style.pointerEvents="none";d.style.top=snow.info.top+"px";d.style.left=snow.info.left+"px";d.style.zIndex=snow.info.zIndex;d.width=f;d.height=g;document.body.appendChild(d);var c=[];for(var a=0;a<snow.info.number;a++){c.push({x:Math.random()*f,y:Math.random()*g,r:Math.random()*4+1,n:Math.random()*70})}var b=d.getContext("2d");var e=0;setInterval(function(){b.clearRect(0,0,f,g);b.fillStyle="rgba(255, 255, 255, 0.6)";b.shadowBlur=5;b.shadowColor="rgba(255, 255, 255, 0.9)";b.beginPath();for(var j=0;j<70;j++){var h=c[j];b.moveTo(h.x,h.y);b.arc(h.x,h.y,h.r,0,Math.PI*2,0)}b.fill();e+=0.01;for(var j=0;j<70;j++){var h=c[j];h.y+=Math.cos(e+h.n)+h.r/2;h.x+=Math.sin(e)*2;if(h.x>f+5||h.x<-5||h.y>g){c[j]=j%3>0?{x:Math.random()*f,y:-10,r:h.r,n:h.n}:Math.sin(e)>0?{x:-5,y:Math.random()*g,r:h.r,n:h.n}:{x:f+5,y:Math.random()*g,r:h.r,n:h.n}}}},35)}};