demo1:会下蛋的机器人

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>spriteJs</title>
    <style>
        body {
            background: black;
        }

        div {
            width: 1000px;
            height: 600px;
            /*border: 1px solid red;*/
            border-radius: 10px;
            margin: 30px auto;
            overflow: hidden;
            background: black;
        }
    </style>
</head>
<body>
<div id="container"></div>
</body>
<script src="https://unpkg.com/spritejs/dist/spritejs.min.js"></script>
<script>
    // localStorage.setItem('language', 'zh-CN');
    let container = document.getElementById('container'),
        width = container.offsetWidth * 2,
        height = container.offsetHeight;

    const {Scene, Sprite} = spritejs;

    const scene = new Scene('#container', {
        // viewport: ['auto', 'auto'],
        resolution: ['flex', 'flex'],
    });
    (async function () {
        await scene.preload({
                id: 'bg',
                src: './img/bgImage.png'
            }, {
                id: 'robot',
                src: './img/robot.png'
            }, {
                id: 'rabbit',
                src: './img/rabbit.png'
            }, {
                id: 'egg1',
                src: './img/dragon-egg1.png'
            }, {
                id: 'egg2',
                src: './img/dragon-egg2.png'
            }, {
                id: 'snow',
                src: './img/snowflake.png'
            }
        )
    })();

    const layer = scene.layer();

    const robot = new Sprite('./img/robot.png');
    const rabbit = new Sprite('rabbit');
    const egg1 = new Sprite('egg1');
    const egg2 = new Sprite('egg2');
    const bg = new Sprite('bg');
    bg.attr({
        anchor: [0, 0],
        x: 0,
        y: 0,
        // size: [1000, 600]
    });
    robot.attr({
        anchor: [0.5, 0],
        x: width,
        y: 0,
        // scale: 0.5
        size: [182, 252]
    });
    let robotHeight = robot.offsetSize[1];

    async function init() {
        let rabbitP = await initEgg(rabbit);
        let egg1P = await initEgg(egg1);
        let egg2P = await initEgg(egg2);
        layer.append(bg);
        layer.append(robot);
        layer.append(rabbitP);
        layer.append(egg1P);
        layer.append(egg2P);
        animateRobot();

        // 创建300片雪花，循环，稍微节省点性能
        for (let i = 0; i < 300; i++) {
            setTimeout(async () => {
                let snow = new Sprite('snow');
                let snowP = await initSnow(snow);
                layer.append(snowP.sprite);
                animateSnow(snowP);
            }, 100 * i);
        }
    }

    // 入口
    init();


    // 初始化蛋蛋
    async function initEgg(egg) {
        await egg.attr({
            anchor: [0.5, 0.5],
            x: width / 2,
            y: (height / 2) + robotHeight,
            opacity: 0
        });
        return egg;
    }

    // 初始化雪花
    async function animateSnow(snow) {
        snow.sprite.animate([
            {
                x: snow.attribute.x,
                y: 0
            },
            {
                x: snow.attribute.x,
                y: height * 2
            }
        ], {
            duration: 5000,
            iterations: Infinity,
            direction: 'default',
        })
    }

    // 雪花的动画
    async function initSnow(snowSpite) {
        var sss = random(20, 100);
        let snow = {
            width: sss,
            height: sss,
            x: random(0, width),
            y: 0,
            opacity: random(0, 1)
        };
        await snowSpite.attr({
            anchor: [0.5, 0.5],
            x: snow.x,
            y: snow.y,
            size: [snow.width, snow.height],
            opacity: snow.opacity
        });
        let obj = {
            attribute: snow,
            sprite: snowSpite
        };
        return obj;
    }


    // 会飞的机器人
    async function animateRobot() {
        await robot.animate([
            {x: width, y: 0},
            {x: width / 2, y: height / 2},
            {x: width / 2, y: height / 2 + 60},
        ], {
            duration: 3500,
            iterations: 1,
            direction: 'default',
        }).finished;

        animateEgg(rabbit, 45);

        await robot.animate([
            {x: width / 2, y: height / 2 + 60},
            {x: width / 2, y: height / 2},
            {x: width / 2, y: height / 2 + 60},
        ], {
            duration: 1500,
            iterations: 1,
            direction: 'default',
        }).finished;

        animateEgg(egg1, -45);

        await robot.animate([
            {x: width / 2, y: height / 2 + 60},
            {x: width / 2, y: height / 2},
            {x: width / 2, y: height / 2 + 60},
        ], {
            duration: 1500,
            iterations: 1,
            direction: 'default',
        }).finished;

        animateEgg(egg2, 0);

        await robot.animate([
            {x: width / 2, y: height / 2 + 60},
            {x: width / 2, y: height / 2},
            {x: 0, y: 0}
        ], {
            duration: 2000,
            iterations: 1,
            direction: 'default',
        }).finished;
        animateRobot();
    }

    // 蛋的动画
    async function animateEgg(egg, deg) {
        egg.animate([
            {
                x: width / 2,
                y: (height / 2) + robotHeight + 60,
                opacity: 1
            },
            {
                x: width / 2 + deg,
                y: (height / 2) + robotHeight + 360,
                opacity: 1
            },
            {
                rotate: deg
            }
        ], {
            duration: 2000,
            iterations: 1,
            direction: 'default',
            // fill: 'forwards'
        });
    }

    // 随机
    function random(min, max) {
        return Math.random() * (max - min) + min;
    }

</script>
</html>