<!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>小球 喷泉运动</title> <meta name="Keywords" content="关键词1,关键词2"> <meta name="description" content="果断，是一种教养和能力"> <!--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"> <style> * { padding:0;margin:0; } body{font-size: 14px;} </style> </head> <body> <canvas id="canvas"></canvas> <script type="text/javascript"> window.onload = function(){ var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); //定义画布样式 canvas.width = window.innerWidth; canvas.height = window.innerHeight; canvas.style.background = "#333"; var cw = canvas.width; var ch = canvas.height; //定义小球个数 var ballNum = 360; var r = 0.2; // var balls = []; for(var i=0;i<ballNum;i++){ var ball = new Ball(); ball.x = cw/2; ball.y = ch; ball.vy = Math.random()*-10-10; ball.vx = Math.random()*2-1; ball.color = getRgb16(); ball.radius = rangeRandom(1,6); balls.push(ball); } function drawCanvas(ball){ cw = window.innerWidth; ch = window.innerHeight; //每个小球方向的改变 ball.vy += r; //每个小球的位置 ball.x += ball.vx; ball.y += ball.vy; ball.color = getRgb16(); ball.radius = rangeRandom(1,6); //边界的控制 if(ball.y-ball.radius > ch || ball.y+ball.radius<0 || ball.x-ball.radius > cw || ball.x+ball.radius<0 ){ //从新初始化 ball.x = cw/2; ball.y = ch; ball.vy = Math.random()*-10-10; ball.vx = Math.random()*2-1; } ball.draw(context); } setInterval(function () { context.clearRect(0,0,cw,ch); balls.forEach(function(ball){ drawCanvas(ball); }); },33); }; function Ball(){ this.x = 0; this.y = 0; this.vx = 0; this.vy = 0; this.radius = 6; } Ball.prototype.draw = function(context){ context.beginPath(); context.fillStyle = this.color; context.arc(this.x,this.y,this.radius,0,Math.PI*2); context.fill(); }; function getRgb(){ //0-255 var r = tRandom(256); var g = tRandom(256); var b = tRandom(256); return "rgb("+r+","+g+","+b+")"; } function getRgb16(){ //0-255 var r = tRandom(256).toString(16); var g = tRandom(256).toString(16); var b = tRandom(256).toString(16); if(r.length<2)r=r+""+r; if(g.length<2)g=g+""+g; if(b.length<2)b=b+""+b; return "#"+r+""+g+""+b; } function rangeRandom(start,end){ return Math.floor(Math.random()*(end-start+1)+start); } function tRandom(start){ return Math.floor(Math.random()*start); } </script> </body> </html>
效果图：
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