<!DOCTYPE html> <html> <head> <title>黑客帝国效果</title> </head> <body> <canvas id="canvas"></canvas> <style type="text/css"> body{margin: 0; padding: 0; overflow: hidden;} </style> <script type="text/javascript"> var canvas = document.getElementById('canvas'); var ctx = canvas.getContext('2d'); canvas.height = window.innerHeight; canvas.width = window.innerWidth; var texts = '0123456789'.split(''); var fontSize = 16; var columns = canvas.width/fontSize; // 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; } 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, canvas.width, canvas.height); //文字颜色 ctx.fillStyle = '#0F0'; ctx.font = fontSize + 'px arial'; //逐行输出文字 for(var i = 0; i < drops.length; i++){ var text = texts[Math.floor(Math.random()*texts.length)]; ctx.fillText(text, i*fontSize, drops[i]*fontSize); if(drops[i]*fontSize > canvas.height || Math.random() > 0.95){ drops[i] = 0; } drops[i]++; } } setInterval(draw, 33); </script> </body>
