黑客帝国雨效果JS

黑客帝国雨效果JS。
<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <style>

    *{margin: 0;padding: 0;}

    body{overflow: hidden;}

    canvas{background: #111;}

    </style>

</head>

<body>

    <canvas id="canvas"></canvas>

    <script>

        var canvas = document.getElementById("canvas");

        var context = canvas.getContext("2d");

        var W = window.innerWidth;

        var H = window.innerHeight;

        canvas.width = W;

        canvas.height = H;

        var fontSize = 16;

        //计算列

        var colunm = Math.floor(W/fontSize);

        //console.log(colunm);

        //存储Y值

        var drops = [];

        for(var i = 0;i<colunm;i++){

            drops[i] = 1;

        }

        //console.log(...drops)

        var str = "Welcome JavaScript";

        //let tempRandom = Math.random()*str.length;

        //console.log(tempRandom,Math.floor(tempRandom))

        //把文字画到屏幕上

        function draw(){

            context.fillStyle = "rgba(0,0,0,0.05)";//文字随机出现的背景

            context.fillRect( 0, 0, W, H);

            context.font = "700 " + fontSize + "px ARIAL";

            context.fillStyle = "#00cc33";

            //context.fillStyle = randColor();

            //console.log("你好");

            for(var i = 0; i<colunm; i++){

                //让字符串中的内容随机出现

                var index = Math.floor(Math.random()*str.length);

                var x = i*fontSize;

                var y = drops[i]*fontSize;

                context.fillText(str[index],x,y);

                console.log(str[index],x,y);

                if(y>=canvas.height && Math.random()>0.99){

                    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,20);

    </script>

</body>

</html>
效果截图：
巴特西

黑客帝国雨效果JS

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