<html>
<head>
<title>黑客帝国-代码雨</title>
<canvas id="canvas" style="background:black" width="620" height="340"></canvas>
<audio autoplay="autoplay" src="C:\Users\gxkj-040\Desktop\黑客帝国代码雨\Rob Dougan、Don Davis - Chateau.mp3"></audio>
<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<colunms;i++){
drops.push(0);
}
//运动的文字
var str ="01abcdefghijklmnopqurstuvwxyzぁぃぅぇぉかきくけこさしすせそたちつってとなにぬねのはひふへほゑまみむめもゃゅょゎをんァィゥヴェォカヵキクケヶコサシスセソタチツッテトヰンナニヌネノハヒフヘホヱマミムメモャュョヮヲ";
//4:fillText(str,x,y);原理就是去更改y的坐标位置
//绘画的函数
function draw(){
//让背景逐渐由透明到不透明
context.fillStyle = "rgba(0,0,0,0.05)";
context.fillRect(0,0,W,H);
//给字体设置样式
//context.font = "700 "+fontSize+"px 微软雅黑";
context.font = fontSize + 'px arial';
//给字体添加颜色
context.fillStyle ="green";//随意更改字体颜色
//写入图形中
for(var i=0;i<colunms;i++){
var index = Math.floor(Math.random() * str.length);
var x = i*fontSize;
var y = drops[i] *fontSize;
context.fillText(str[index],x,y);
//如果要改变时间，肯定就是改变每次他的起点
if(y >= 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>
<style type="text/css">
body{margin: 0; padding: 0; overflow: hidden;}
</style>
</head>
<body>
</body>
</html>
