js实现一个小游戏（飞翔的jj）

源代码+素材图片在我的仓库

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>飞翔的林俊杰</title>

    <style>

        * {

            padding: 0;

            margin: 0;

        }

        #canvas{

            margin-left:100px;

        }

    </style>

</head>

<body>

    <canvas id="canvas" width="1200px" height="600px"></canvas>

    <div id="res">

        键盘点击↑即可跳跃

        <h2 id="mark">得分：0</h2>

    </div>

    <script>

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

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

        //创建一个图片

        var img = new Image();

        img.src = './img/jj.png';

        //等图片加载结束

        var jjx = 100, jjy = 100;

        img.onload = function () {

            context.drawImage(img, jjx, jjy);

        }

        creatColum();

        //定义一个计算器下落

        var jjtimer = setInterval( function() {

                            jjy++;

                            jjy = jjy > 540 ? 540 : jjy;

                            //把上一张画布清空，确保再次画的时候背景是白纸状态

                            //参数 开始清空的地方(前两个参数)、宽、高

                            context.clearRect(0, 0, 1200, 600);

                            drawColum();

                            context.drawImage(img, jjx, jjy);

                        }, 10)

        document.onkeydown = function(e) {

            if(e.keyCode == 38)

                jjy -=25;

        }

        var columArr = [], colomTimer = null;

        function creatColum () {

            colomTimer = setInterval(function() {

                var colum = {};//柱子容器

                colum.x = 1150;

                colum.y = -Math.round(Math.random()*150 + 150);

                colum.top = new Image();

                colum.bottom = new Image();

                colum.top.src = './img/colom.jpg';

                colum.bottom.src = './img/colom.jpg';

                colum.id = new Date().getTime();

                columArr.push(colum);

            }, 1500);

        }

        var same = null , mark = 0;

        function drawColum() {

            for (var i = 0; i< columArr.length; i++) {

                columArr[i].x--;

                context.drawImage(columArr[i].top,columArr[i].x,columArr[i].y+50);

                context.drawImage(columArr[i].bottom,columArr[i].x,columArr[i].y+440);

                if (jjx + 37 >= columArr[i].x && jjx - 53 <= columArr[i].x) {

                    // console.log("经过");

                    //加分

                    if (columArr[i].id != same) {

                        mark+=10;

                        same = columArr[i].id;

                        document.getElementById("mark").innerHTML = "得分：" + mark;

                    }

                    //判断碰撞

                    if (jjy < columArr[i].y + 355 || jjy > columArr[i].y+407) {

                        clearInterval( colomTimer);

                        clearInterval( jjtimer);

                        confirm("最终得分："+mark)

                    }

                }

            }

        }

    </script>

</body>

</html>
巴特西

js实现一个小游戏（飞翔的jj）

js实现一个小游戏（飞翔的jj）

源代码+素材图片在我的仓库

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