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; <script type="text/javascript"> window.onload = function(){ //获取图形对象 var canvas = document.getElementById("canvas"); //获取图形的上下文 var context = canvas.getContext("2d"); //获取浏览器屏幕的宽度和高度 var W = window.innerWidth; var H = window.innerHeight; //设置canvas的宽度和高度 canvas.width = W; canvas.height = H; //每个文字的字体大小 var fontSize = 15; //计算列 var colunms = Math.floor(W /fontSize); //记录每列文字的y轴坐标 var drops = []; //给每一个文字初始化一个起始点的位置 for(var i=0;i= canvas.height && Math.random() > 0.92){ drops[i] = 0; } drops[i]++; } }; function randColor(){ 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+")"; } draw(); setInterval(draw,33); }; </script>