• 烟花效果，H5+C3+JS实现

    DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>111title>
    <style>
        body {
            background-color: #000000;
            margin: 0;
            overflow: hidden;
        }

        html {
            height: 100%;
            overflow: hidden;
        }

        body {
            height: 100%;
            margin: 0;
        }

        #test {
            background: #000000;
        }
    style>
    <script type="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js">script>
head>

<body>
<canvas id="test">canvas>
<script>
    const cvs = document.getElementById('test');
    //canvas充满窗口
    cvs.width = window.innerWidth;
    cvs.height = window.innerHeight / 2.8;
    //画笔
    const ctx = cvs.getContext('2d');

    //颜色数组
    const colors = ['red', 'yellow'];

    /*文字内容*/
    const text = 'cqf';
    const text2 = '哈哈哈';

    /*文字位置*/
    const [x, y] = [window.innerWidth / 2.5, window.innerHeight / 5];
    const [a, b] = [window.innerWidth / 4, window.innerHeight / 3];

    //字体属性
    ctx.font = 'bold 80px arial';

    function draw() {
        //保存上下文对象的状态
        ctx.save();
        //设置描边样式
        ctx.strokeStyle = colors[0];
        //设置描边宽度
        ctx.lineWidth = 1;
        //虚线
        ctx.setLineDash([8]);
        //以描边的方式显示路径
        ctx.strokeText(text, x, y);
        ctx.strokeText(text2, a, b);

        //第二部分虚线
        ctx.lineDashOffset = 8;
        ctx.strokeStyle = colors[1];
        //光晕
        ctx.shadowColor = 'orange';
        //多画几遍光晕
        for (let i = 25; i > 3; i -= 2) {
            ctx.shadowBlur = i;
            ctx.strokeText(text, x, y);
        }
        for (let i = 25; i > 3; i -= 2) {
            ctx.shadowBlur = i;
            ctx.strokeText(text2, a, b);
        }
        //将上下文对象的状态恢复到上一次保存时的状态
        ctx.restore();
    }

    draw();

    setInterval(function () {
        ctx.clearRect(0, 0, cvs.width, cvs.height);
        draw();
        colors.reverse();
    }, 500)


    var SCREEN_WIDTH = window.innerWidth,
        SCREEN_HEIGHT = window.innerHeight,
        mousePos = {
            x: 50,
            y: 300
        },

// create canvas
        canvas = document.createElement('canvas'),
        context = canvas.getContext('2d'),
        particles = [],
        rockets = [],
        MAX_PARTICLES = 400,
        colorCode = 0;

    // init
    $(document).ready(function () {
        document.body.appendChild(canvas);
        canvas.width = SCREEN_WIDTH;
        canvas.height = SCREEN_HEIGHT;
        setInterval(launch, 600);
        setInterval(loop, 1000 / 50);
    });

    // update mouse position
    $(document).mousemove(function (e) {
        e.preventDefault();
        mousePos = {
            x: e.clientX,
            y: e.clientY
        };
    });

    // launch more rockets!!!
    $(document).mousedown(function (e) {
        for (var i = 0; i < 5; i++) {
            // 底下发射的横坐标位置
            launchFrom(SCREEN_WIDTH);
        }
    });

    function launch() {
        // 底下发射的横坐标位置
        launchFrom(650);
    }

    function launchFrom(x) {
        if (rockets.length < 100) {
            var rocket = new Rocket(x);
            rocket.explosionColor = Math.floor(Math.random() * 360 / 10) * 10;
            rocket.vel.y = Math.random() * -3 - 4;
            rocket.vel.x = Math.random() * 8 - 3;
            rocket.size = 8;
            rocket.shrink = 0.999;
            rocket.gravity = 0.0000001;
            rockets.push(rocket);
        }
    }

    function loop() {
        // update screen size
        if (SCREEN_WIDTH !== window.innerWidth) {
            canvas.width = SCREEN_WIDTH = window.innerWidth;
        }
        if (SCREEN_HEIGHT !== window.innerHeight) {
            canvas.height = SCREEN_HEIGHT = window.innerHeight;
        }

        // clear canvas
        context.fillStyle = "rgba(0, 0, 0, 0.05)";
        context.fillRect(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);

        var existingRockets = [];

        for (var i = 0; i < rockets.length; i++) {
            // update and render
            rockets[i].update();
            rockets[i].render(context);

            // calculate distance with Pythagoras
            var distance = Math.sqrt(Math.pow(mousePos.x - rockets[i].pos.x, 2) + Math.pow(mousePos.y - rockets[i].pos.y, 2));

            // random chance of 1% if rockets is above the middle
            var randomChance = rockets[i].pos.y < (SCREEN_HEIGHT * 2 / 3) ? (Math.random() * 100 <= 1) : false;

            /* Explosion rules
             - 80% of screen
             - going down
             - close to the mouse
             - 1% chance of random explosion
             */
            if (rockets[i].pos.y < SCREEN_HEIGHT / 5 || rockets[i].vel.y >= 0 || distance < 50 || randomChance) {
                rockets[i].explode();
            } else {
                existingRockets.push(rockets[i]);
            }
        }

        rockets = existingRockets;

        var existingParticles = [];

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

            // render and save particles that can be rendered
            if (particles[i].exists()) {
                particles[i].render(context);
                existingParticles.push(particles[i]);
            }
        }

        // update array with existing particles - old particles should be garbage collected
        particles = existingParticles;

        while (particles.length > MAX_PARTICLES) {
            particles.shift();
        }
    }

    function Particle(pos) {
        this.pos = {
            x: pos ? pos.x : 0,
            y: pos ? pos.y : 0
        };
        this.vel = {
            x: 0,
            y: 0
        };
        this.shrink = .97;
        this.size = 2;

        this.resistance = 1;
        this.gravity = 0;

        this.flick = false;

        this.alpha = 1;
        this.fade = 0;
        this.color = 0;
    }

    Particle.prototype.update = function () {
        // apply resistance
        this.vel.x *= this.resistance;
        this.vel.y *= this.resistance;

        // gravity down
        this.vel.y += this.gravity;

        // update position based on speed
        this.pos.x += this.vel.x;
        this.pos.y += this.vel.y;

        // shrink
        this.size *= this.shrink;

        // fade out
        this.alpha -= this.fade;
    };

    Particle.prototype.render = function (c) {
        if (!this.exists()) {
            return;
        }

        c.save();

        c.globalCompositeOperation = 'lighter';

        var x = this.pos.x,
            y = this.pos.y,
            r = this.size / 2;

        var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
        gradient.addColorStop(0.1, "rgba(255,255,255," + this.alpha + ")");
        gradient.addColorStop(0.8, "hsla(" + this.color + ", 100%, 50%, " + this.alpha + ")");
        gradient.addColorStop(1, "hsla(" + this.color + ", 100%, 50%, 0.1)");

        c.fillStyle = gradient;

        c.beginPath();
        c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size : this.size, 0, Math.PI * 2, true);

        c.closePath();
        c.fill();

        c.restore();
    };

    Particle.prototype.exists = function () {
        return this.alpha >= 0.1 && this.size >= 1;
    };

    function Rocket(x) {
        Particle.apply(this, [{
            x: x,
            y: SCREEN_HEIGHT
        }]);

        this.explosionColor = 0;
    }

    Rocket.prototype = new Particle();
    Rocket.prototype.constructor = Rocket;

    Rocket.prototype.explode = function () {
        var count = Math.random() * 10 + 80;

        for (var i = 0; i < count; i++) {
            var particle = new Particle(this.pos);
            var angle = Math.random() * Math.PI * 2;

            // emulate 3D effect by using cosine and put more particles in the middle
            var speed = Math.cos(Math.random() * Math.PI / 2) * 15;

            particle.vel.x = Math.cos(angle) * speed;
            particle.vel.y = Math.sin(angle) * speed;

            particle.size = 10;

            particle.gravity = 0.2;
            particle.resistance = 0.92;
            particle.shrink = Math.random() * 0.05 + 0.93;

            particle.flick = true;
            particle.color = this.explosionColor;

            particles.push(particle);
        }
    };

    Rocket.prototype.render = function (c) {
        if (!this.exists()) {
            return;
        }

        c.save();

        c.globalCompositeOperation = 'lighter';

        var x = this.pos.x,
            y = this.pos.y,
            r = this.size / 2;

        var gradient = c.createRadialGradient(x, y, 0.1, x, y, r);
        gradient.addColorStop(0.1, "rgba(255, 255, 255 ," + this.alpha + ")");
        gradient.addColorStop(1, "rgba(0, 0, 0, " + this.alpha + ")");

        c.fillStyle = gradient;

        c.beginPath();
        c.arc(this.pos.x, this.pos.y, this.flick ? Math.random() * this.size / 2 + this.size / 2 : this.size, 0, Math.PI * 2, true);
        c.closePath();
        c.fill();

        c.restore();
    };

script>
body>

html>


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  • 原文地址：https://blog.csdn.net/qq_40306697/article/details/133699004