仿黑客帝国

<canvas id=”canvas”>请使用高版本浏览器，IE8以及一下不支持canvas</canvas>
<script type=”text/javascript”>
window.onload = function() {
var width,height,
canvas = document.getElementById(“canvas”);
canvas.width = width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
canvas.height = height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
var ctx = canvas.getContext(‘2d’);
var num = Math.ceil(width / 10);
var y = Array(num).join(0).split(‘’);
var draw = function() {
ctx.fillStyle = ‘rgba(0,0,0,.05)’; //核心代码，创建黑色背景，透明度为0.05的填充色。
ctx.fillRect(0, 0, width, height);
ctx.fillStyle = ‘#0f0’; //设置了字体颜色为绿色
ctx.font = ‘10px Microsoft YaHei’; //设置字体大小与family
for(i = 0; i < num; i++) {
var x = (i * 10) + 40;
text = String.fromCharCode(65 + Math.random() * 62);
var y1 = y[i];
ctx.fillText(text, x, y1);
if(y1 > Math.random() * 10 * height) {
y[i] = 0;
} else {
y[i] = parseInt(y[i]) + 10;
}
}
}

;(function(){
setInterval(draw, 100);
})();

}
</script>

//复制到txt，后缀名改为html
仿黑客帝国

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