theMatrix代码雨效果

做了一个代码雨效果放在个人主页: https://lanleilin.github.io/lanGallery/index.html
代码：
<!DOCTYPE html>

<html>

    <head>

        <title>The Matrix</title>

        <script type="text/javascript" src="../js/jquery.min.js">

        </script>

        <meta charset="utf-8">

        <script>

            $(document).ready(function() {

                //判断移动端还是PC端

                function isPC() {

                    var userAgentInfo = navigator.userAgent;

                    var Agents = ["Android", "iPhone", "SymbianOS", "Windows Phone", "iPad", "iPod"];

                    var flag = true;

                    for(var v = 0; v < Agents.length; v++) {

                        if(userAgentInfo.indexOf(Agents[v]) > 0) {

                            flag = false;

                            break;

                        }

                    }

                    return flag;

                }

                if(!isPC()) {

                    // 手机

                    var s = window.screen;

                    console.log(s);

                    var width = s.width * 2.5;

                    q.width = s.width * 2.5;

                    q.Height = 300;

                    var height = q.height;

                    var yPositions = Array(300).join(0).split('');

                    var ctx = q.getContext('2d');

                    var draw = function() {

                        ctx.fillStyle = 'rgba(0,0,0,.05)'; //反复生成opacity为0.5的半透明黑色背景

                        ctx.fillRect(0, 0, width, height);

                        ctx.fillStyle = 'lightgreen';

                        ctx.font = '3rem Georgia';

                        yPositions.map(function(y, index) {

                            text = String.fromCharCode(1e2 + Math.random() * 33); //随机生成字母

                            x = (index * 30) + 10; //x距离

                            q.getContext('2d').fillText(text, x, y); //在指定位置显示一个字母

                            if(y > Math.random() * 1e4) {

                                yPositions[index] = 0;

                            } else {

                                yPositions[index] = y + 20; //确定显示字母的位置

                            }

                        });

                    };

                    RunMatrix();

                    function RunMatrix() {

                        Game_Interval = setInterval(draw, 50); //设定刷新间隔

                    }

                } else {

                    var s = window.screen;

                    //      var q=$('#q');

                    console.log(typeof($("#q")));

                    console.log(document.getElementById("q"));

                    var width = q.width = s.width;

                    var height = q.height;

                    var yPositions = Array(300).join(0).split('');

                    var ctx = q.getContext('2d');

                    var draw = function() {

                        ctx.fillStyle = 'rgba(0,0,0,.05)';

                        ctx.fillRect(0, 0, width, height);

                        ctx.fillStyle = 'red';

                        ctx.font = '10pt Georgia';

                        yPositions.map(function(y, index) {

                            text = String.fromCharCode(1e2 + Math.random() * 33);

                            x = (index * 10) + 10; //x距离

                            q.getContext('2d').fillText(text, x, y);

                            if(y > Math.random() * 1e4) {

                                yPositions[index] = 0;

                            } else {

                                yPositions[index] = y + 10;

                            }

                        });

                    };

                    RunMatrix();

                    function RunMatrix() {

                        Game_Interval = setInterval(draw, 50);

                    }

                }

                isPC();

            });

        </script>

    </head>

    <body>

        <div align="center">

            <h1 id="theMatrix">The matrix</h1>

            <canvas id="q" width="500" height="500"></canvas>

        </div>

    </body>

</html>
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theMatrix代码雨效果

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