<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>黑客帝国文字下落</title>
<style>
html, body {margin:0; padding:0; background-color:#000;}
</style>
<script src="http://apps.bdimg.com/libs/jquery/1.9.0/jquery.min.js"></script>
</head>
<body>
<canvas id="matrix" height="943" width="1920"></canvas>
<script type="text/javascript">
//文字
var txts = "0123456789!@#$%^&*()~_+℃○※";
//转为数组
txts = txts.split("");
var matrix=document.getElementById("matrix");
var context=matrix.getContext("2d");
matrix.height=window.innerHeight;
matrix.width=window.innerWidth;
var drop=[];
var font_size=16;
var columns=matrix.width/font_size;
for(var i=0;i<columns;i++)
drop[i]=1;
function drawMatrix(){
context.fillStyle="rgba(0, 0, 0, 0.09)";
context.fillRect(0,0,matrix.width,matrix.height);
context.fillStyle="green";
context.font=font_size+"px";
for(var i=0;i<columns;i++){
//随机取要输出的文字
var text = txts[Math.floor(Math.random()*txts.length)];
//输出文字，注意坐标的计算
context.fillText(text,i*font_size,drop[i]*font_size);/*get 0 and 1*/
if(drop[i]*font_size>(matrix.height*2/3)&&Math.random()>0.95)/*reset*/
drop[i]=0;
drop[i]++;
}
}
setInterval(drawMatrix,33);
</script>
</body>
</html>
