鼠标移动出现雪花-js实现

// 鼠标移动出现雪花.html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script src="https://wow.techbrood.com/libs/jquery/jquery-1.11.1.min.js"></script>
</head>
<body>
    <script type="text/javascript">
        (function snowflakeCursor() {

    var possibleEmoji = ["❄️"]
    var width = window.innerWidth;
    var height = window.innerHeight;
    var cursor = {
        x: width / 2,
        y: width / 2
    };
    var particles = [];

    function init() {
        bindEvents();
        loop();
    }

    // Bind events that are needed
    function bindEvents() {
        document.addEventListener('mousemove', onMouseMove);
        document.addEventListener('touchmove', onTouchMove);
        document.addEventListener('touchstart', onTouchMove);

        window.addEventListener('resize', onWindowResize);
    }

    function onWindowResize(e) {
        width = window.innerWidth;
        height = window.innerHeight;
    }

    function onTouchMove(e) {
        if (e.touches.length > 0) {
            for (var i = 0; i < e.touches.length; i++) {
                addParticle(e.touches[i].clientX, e.touches[i].clientY, possibleEmoji[Math.floor(Math.random() * possibleEmoji.length)]);
            }
        }
    }

    function onMouseMove(e) {
        cursor.x = e.clientX;
        cursor.y = e.clientY;

        addParticle(cursor.x, cursor.y, possibleEmoji[Math.floor(Math.random() * possibleEmoji.length)]);
    }

    function addParticle(x, y, character) {
        var particle = new Particle();
        particle.init(x, y, character);
        particles.push(particle);
    }

    function updateParticles() {

        // Updated
        for (var i = 0; i < particles.length; i++) {
            particles[i].update();
        }

        // Remove dead particles
        for (var i = particles.length - 1; i >= 0; i--) {
            if (particles[i].lifeSpan < 0) {
                particles[i].die();
                particles.splice(i, 1);
            }
        }

    }

    function loop() {
        requestAnimationFrame(loop);
        updateParticles();
    }

    /**
     * Particles
     */

    function Particle() {

        this.initialStyles = {
            "position": "absolute",
            "display": "block",
            "pointerEvents": "none",
            "z-index": "10000000",
            "fontSize": "16px",
            "will-change": "transform"
        };

        // Init, and set properties
        this.init = function(x, y, character) {

            this.velocity = {
                x: (Math.random() < 0.5 ? -1 : 1) * (Math.random() / 2),
                y: (1 + Math.random())
            };

            this.lifeSpan = 120 + Math.floor(Math.random() * 60); //ms

            this.position = {
                x: x - 20,
                y: y - 20
            };

            this.element = document.createElement('span');
            this.element.innerHTML = character;
            applyProperties(this.element, this.initialStyles);
            this.update();

            document.body.appendChild(this.element);
        };

        this.update = function() {
            this.position.x += this.velocity.x;
            this.position.y += this.velocity.y;

            this.velocity.x += (Math.random() < 0.5 ? -1 : 1) * 2 / 75;
            this.velocity.y -= Math.random() / 400;

            this.lifeSpan--;

            this.element.style.transform = "translate3d(" + this.position.x + "px," + this.position.y + "px,0) scale(" + (this.lifeSpan / 180) + ") rotate(" + (2 * this.lifeSpan) + "deg)";

        }


        this.die = function() {
            this.element.parentNode.removeChild(this.element);
        }

    }

    /**
     * Utils
     */

    // Applies css `properties` to an element.
    function applyProperties(target, properties) {
        for (var key in properties) {
            target.style[key] = properties[key];
        }
    }

    init();
})();
    </script>
</body>
</html>

posted @ 2021-05-05 21:25 十一的杂文录阅读(285) 评论(0) 编辑收藏举报

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