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canvas做的背景
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>背景</title> | |
| <style> | |
| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| body {background: black;} | |
| canvas {display: block;} | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="c"></canvas> | |
| <script> | |
| var c = document.getElementById("c"); | |
| var ctx = c.getContext("2d"); | |
| // 全屏展示 | |
| c.height = window.innerHeight; | |
| c.width = window.innerWidth; | |
| var chinese = "田由甲申甴电甶男甸甹町画甼甽甾甿畀畁畂畃畄畅畆畇畈畉畊畋界畍畎畏畐畑"; | |
| chinese = chinese.split("") | |
| var fontSize = 10; | |
| var columns = c.width/fontSize; | |
| var drops = []; | |
| for(var x = 0;x < columns;x++) | |
| drops[x] = 1; | |
| //下落背景 | |
| function draw() { | |
| ctx.fillStyle = "rgba(0,0,0,0.5)"; | |
| ctx.fillRect(0,0,c.width,c.height); | |
| ctx.fillStyle = "#0f0"; // 绿色的文字 | |
| ctx.font = fontSize + "px arial"; | |
| for(var i = 0;i < drops.length;i++) { | |
| var text = chinese[Math.floor(Math.random()*chinese.length)]; | |
| ctx.fillText(text,i*fontSize,drops[i]*fontSize); | |
| if(drops[i]*fontSize > c.height && Math.random() > 0.975) | |
| drops[i] = 0; | |
| drops[i]++; | |
| } | |
| } | |
| setInterval(draw,33); | |
| </script> | |
| </body> | |
| </html> |
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