<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>唯美雨落</title> <meta name="Keywords" content="关键词1,关键词2"> <meta name="description" content="网页的描述内容"> <!--响应式mate标签--> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no, minimal-ui"> <meta name="apple-mobile-web-app-capable" content="yes"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <base target="_blank"/> <style> </style> </head> <body> <canvas id="canvas" style="position: absolute; top: 0px; left: 0px; opacity: 0.58;" width="1366" height="216"></canvas> <script src="http://cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script> <script type="text/javascript"> var c = document.getElementById("canvas"); var ctx = c.getContext("2d"); var w = c.width = window.innerWidth; var h = c.height = window.innerHeight; var clearColor = 'rgba(0, 0, 0, 0.1)'; var max = 60; var drops = []; function random(min, max) { return Math.random() * (max - min) + min; } function randomColor(){ var r = Math.floor(Math.random()*256); var g = Math.floor(Math.random()*256); var b = Math.floor(Math.random()*256); return "rgb("+r+","+g+","+b+")";//IE7不支出rgb }; function O() {} O.prototype = { init: function() { this.x = random(0, w); this.y = 0; this.color = randomColor(); this.w = 2; this.h = 1; this.vy = random(4, 5); this.vw = 3; this.vh = 1; this.size = 2; this.hit = random(h * .8, h * .9); this.a = 0.5; this.va = .96; }, draw: function() { if (this.y > this.hit) { ctx.beginPath(); ctx.moveTo(this.x, this.y - this.h / 2); ctx.bezierCurveTo( this.x + this.w / 2, this.y - this.h / 2, this.x + this.w / 2, this.y + this.h / 2, this.x, this.y + this.h / 2); ctx.bezierCurveTo( this.x - this.w / 2, this.y + this.h / 2, this.x - this.w / 2, this.y - this.h / 2, this.x, this.y - this.h / 2); ctx.strokeStyle = 'hsla(180, 100%, 50%, '+this.a+')'; ctx.stroke(); ctx.closePath(); } else { ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y, this.size, this.size * 5); } this.update(); }, update: function() { if(this.y < this.hit){ this.y += this.vy; } else { if(this.a > .03){ this.w += this.vw; this.h += this.vh; if(this.w > 100){ this.a *= this.va; this.vw *= .98; this.vh *= .98; } } else { this.init(); } } } } function resize(){ w = c.width = window.innerWidth; h = c.height = window.innerHeight; } function setup(){ canvas.style.opacity = "0.58"; for(var i = 0; i < max; i++){ (function(j){ setTimeout(function(){ var o = new O(); o.init(); drops.push(o); }, j * 100) }(i)); } } function anim() { ctx.fillStyle = clearColor; ctx.fillRect(0,0,w,h); for(var i in drops){ drops[i].draw(); } requestAnimationFrame(anim); } window.addEventListener("resize", resize); setup(); anim(); </script> </body> </html>
效果图：
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