<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no">
<style>
html, body {
overflow: hidden;
margin: 0;
}
body {
font-family: 'Open Sans', 'Helvetica Neue', 'Hiragino Sans GB', 'LiHei Pro', Arial, sans-serif;
color: #333;
}
canvas {
position: absolute;
top: 0;
left: 0;
z-index: 0;
width: 100%;
height: 100%;
pointer-events: none;
}
</style>
</head>
<body>
<canvas></canvas>
<script>
document.addEventListener('touchmove', function (e) {
e.preventDefault()
})
var c = document.getElementsByTagName('canvas')[0],
x = c.getContext('2d'),
pr = window.devicePixelRatio || 1,
w = window.innerWidth,
h = window.innerHeight,
f = 90,
q,
m = Math,
r = 0,
u = m.PI*2,
v = m.cos,
z = m.random
c.width = w*pr
c.height = h*pr
x.scale(pr, pr)
x.globalAlpha = 0.6
function i(){
x.clearRect(0,0,w,h)
q=[{x:0,y:h*.7+f},{x:0,y:h*.7-f}]
while(q[1].x<w+f) d(q[0], q[1])
}
function d(i,j){
x.beginPath()
x.moveTo(i.x, i.y)
x.lineTo(j.x, j.y)
var k = j.x + (z()*2-0.25)*f,
n = y(j.y)
x.lineTo(k, n)
x.closePath()
r-=u/-50
x.fillStyle = '#'+(v(r)*127+128<<16 | v(r+u/3)*127+128<<8 | v(r+u/3*2)*127+128).toString(16)
x.fill()
q[0] = q[1]
q[1] = {x:k,y:n}
}
function y(p){
var t = p + (z()*2-1.1)*f
return (t>h||t<0) ? y(p) : t
}
document.onclick = i
document.ontouchstart = i
i()
</script>
</body>
</html>
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