<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> *{ margin: 0; padding: 0; } </style> </head> <body> <canvas id="c"></canvas> <script type="text/javascript" > var c = document.getElementById("c"); var ctx = c.getContext("2d"); //全屏 c.height = window.innerHeight; c.width = window.innerWidth; txts=[0,1,2,3,4,5,6,7,8,9] var font_size = 16; var columns = c.width/font_size; //用于计算输出文字时坐标,所以长度即为列数 var drops = []; //初始值 for(var x = 0; x < columns; x++) drops[x] = 1; //输出文字 function draw() { //让背景逐渐由透明到不透明 ctx.fillStyle = "rgba(0, 0, 0, 0.05)"; ctx.fillRect(0, 0, c.width, c.height); ctx.fillStyle = "#0F0"; //文字颜色 ctx.font = font_size + "px arial"; //逐行输出文字 for(var i = 0; i < drops.length; i++) { //随机取要输出的文字 var text = txts[Math.floor(Math.random()*txts.length)]; //如果绘满一屏或随机数大于0.95(此数可自行调整,效果会不同) if(drops[i]*font_size > c.height || Math.random() > 0.95){ drops[i] = 0;} //输出文字,注意坐标的计算 ctx.fillText(text, i*font_size, drops[i]*font_size); //用于Y轴坐标增加 drops[i]++; } } setInterval(draw, 33); </script> </body> </html>
时间: 2024-07-30 22:36:48