<!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>triangle</title> </head> <body> <canvas></canvas> </body> </html> <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>
效果:
