special effects - 鼠标移动，出现星星拖尾

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已于 2022-07-12 11:42:53 修改

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分类专栏： # 特效__鼠标文章标签： javascript

于 2022-07-12 11:13:10 首次发布

本文链接：https://blog.youkuaiyun.com/Jie_1997/article/details/125739266

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这个示例展示了如何使用HTML、CSS和JavaScript实现鼠标移动时在屏幕上留下星星拖尾的效果。代码通过监听鼠标和触摸事件，动态生成带有随机颜色的星星元素，并根据鼠标位置更新星星的位置，从而形成拖尾视觉效果。

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一. 效果图

在这里插入图片描述

二. 实现代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>鼠标移动出现星星拖尾</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        html {
            background-color: #c3ecff;
        }
    </style>
</head>

<body>
    <script>
        (function fairyDustCursor() {
            var possibleColors = ["#D61C59", "#E7D84B", "#1B8798"]
            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, possibleColors[Math.floor(Math.random() * possibleColors.length)]);
                    }
                }
            }

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

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

            function addParticle(x, y, color) {
                var particle = new Particle();
                particle.init(x, y, color);
                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.character = "*";
                this.lifeSpan = 120; //ms
                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, color) {

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

                    this.position = { x: x - 10, y: y - 20 };
                    this.initialStyles.color = color;
                    console.log(color);

                    this.element = document.createElement('span');
                    this.element.innerHTML = this.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.lifeSpan--;

                    this.element.style.transform = "translate3d(" + this.position.x + "px," + this.position.y + "px,0) scale(" + (this.lifeSpan / 120) + ")";
                }

                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>