话不多说，请看代码：
<!doctype html> <html> <head> <meta charset="utf-8"> <title>万花筒</title> <style> canvas{ background:#eee; } </style> <script> window.onload = function(){ var canvas = document.getElementById("canvas"); var cobj = canvas.getContext("2d"); var arr = []; var t=setInterval(function(){ cobj.clearRect(0,0,600,600); for(var i=0;i<arr.length;i++){ cobj.save(); cobj.translate(300,300); cobj.scale(arr[i].scales,arr[i].scales); cobj.rotate(arr[i].angle*Math.PI/180); cobj.fillStyle = arr[i].color; cobj.fillRect(arr[i].num,arr[i].num,30,30); cobj.restore(); } },50); setInterval(function(){ for(var i=0;i<arr.length;i++){ if(arr[i].num<=0){ arr.splice(i,1); continue; } arr[i].angle+=2; arr[i].num-=0.2; arr[i].scales-=0.002; if(arr[i].scales<=0.2){ arr[i].scales=0.2; } } },50); setInterval(function(){ var rect = {angle:0,num:150,scales:1,color:"rgb("+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+")"}; arr.push(rect); },600); } </script> </head> <body> <canvas></canvas> </body> </html>