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【用三大件写出的开门烟花特效】

又到了一年一度的春节时期啦！昨天呢是北方的小年，今天是南方的小年，看到大家可以愉快的放烟花，过大年很是羡慕呀！辞旧岁，贺新春，今年我呀要放烟花，过春节！🧨。

这个特效简单的使用了前端三件套即可完成，html，js，css，canvas整体效果如下GIF图所示（码内隐藏特殊变量，找到有惊喜！）

背景音乐是《China-E》个人感觉很有新年的感觉，整个China系列的歌曲都很nice，该特效的寓意就是开门大吉，辞旧迎新，2023年的大门向你敞开，新的一年想你招手，小兔子抱着锦鲤，也预示着吉祥，山鱼在这里祝大家前兔无量，大展宏兔！

就是开心，就是玩，就是兔个吉利！，话不多说上代码！

<body>
    <!-- 依旧是简洁的html代码 -->
    <canvas id="mycanvas"></canvas>

    <div id="box">
        <button type="button" id="unmuteButton">开启新年音乐</button>
        <button type="button" id="unmuteButton2">关闭新年音乐</button>
        <video id="video" muted autoplay src="./audio/新年音乐.mp3" loop></video>
    </div>
</body>

比较多的css代码，所以单独放在了一个文件下，如果用的时候出现图片丢失的问题，可以看看路径写对了没

/* 如果单独放记得去掉style标签哦 */
<style>
* {
    margin: 0;
    padding: 0;
}

body {
    overflow: hidden;
    margin: 0;
    cursor: pointer;
    font-size: 30px;
    background: url("../img/辞旧岁贺新春兔年.png");
    background-size: 100% 100%;
}

#unmuteButton {
    position: absolute;
    z-index: -1;
    top: 0;
    left: 0;
    font-size: 10px;
    font-family: "STHupo";
    width: 80px;
    height: 30px;
    border: 1px solid red;
    background-color: rgb(255, 115, 0);
    border-radius: 10%;
}

#unmuteButton2 {
    position: absolute;
    z-index: -1;
    top: 0px;
    left: 120px;
    font-size: 10px;
    font-family: "STHupo";
    width: 80px;
    height: 30px;
    border: 1px solid red;
    background-color: rgb(255, 115, 0);
    border-radius: 10%;
}

#video {
    position: absolute;
    top: -100000;
    left: -100000;
}

#box {
    position: absolute;
    z-index: 1;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
}

#box::before,
#box::after {
    content: '';
    z-index: 99;
    margin-top: -37px;
    float: left;
    width: 50%;
    height: 1000px;
    background: url("../img/兔子2023.png") no-repeat;
    transition: .4s;
}

#box::before {
    float: left;
    background-position: -220px 37px;
}

#box::after {
    float: right;
    background-position: -210px;
}

#box:hover::before {
    transform: translateX(-100%)
}

#box:hover::after {
    transform: translateX(100%)
}

/* 去除滚动条 */
body::-webkit-scrollbar {
    width: 0 !important
}
</style>

比比比比较多的js代码，注意同上

// 烟花生成
window.requestAnimationFrame = (function () {
    return window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        function (callback) {
            window.setTimeout(callback, 1000)
        }
})();
// 获取画布
var area = document.getElementById("mycanvas");
area.width = document.documentElement.clientWidth;
area.height = document.documentElement.clientHeight;

var ctx = area.getContext("2d");

hue = 120;
timerTick = 0;
timerTotal = 5;
fireworks = [];
particles = [];

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

function distans(sx, sy, tx, ty) {
    var xdistan = sx - tx;
    var ydistan = sy - ty;
    return Math.sqrt((Math.pow(xdistan, 2) + Math.pow(ydistan, 2)));
}

function Firework(sx, sy, tx, ty) {
    this.x = sx;
    this.y = sy;
    this.sx = sx;
    this.sy = sy;
    this.tx = tx;
    this.ty = ty;

    this.targetDistances = distans(sx, sy, tx, ty);

    this.distancesc = 0;

    this.shanyu = [];
    this.shanyucount = 3;
    while (this.shanyucount--) {
        this.shanyu.push([this.x, this.y]);
    }

    this.angle = Math.atan2(ty - sy, tx - sx);
    this.speed = 2;
    this.jiasudu = 1.05;
    this.brightness = random(50, 70);
    this.targetRad = 5;
}

Firework.prototype.update = function (index) {
    this.shanyu.pop();
    this.shanyu.push([this.x, this.y]);

    if (this.targetRad < 8) {
        this.targetRad += 0.3;
    } else {
        this.targetRad = 1;
    }

    this.speed *= this.jiasudu;
    var vx = Math.cos(this.angle) * this.speed;
    var vy = Math.sin(this.angle) * this.speed;

    this.distancesc = distans(this.sx, this.sy, this.x + vx, this.y + vy);

    if (this.distancesc >= this.targetDistances) {

        createparticals(this.tx, this.ty);

        fireworks.splice(index, 1)
    } else {
        this.x += vx;
        this.y += vy;
    }
}

Firework.prototype.draw = function () {
    ctx.beginPath();

    ctx.moveTo(this.shanyu[this.shanyu.length - 1][0], this.shanyu[this.shanyu.length - 1][1]);

    ctx.lineTo(this.x, this.y);

    ctx.strokeStyle = 'hsl(' + hue + ',100%,' + this.brightness + '%)';
    ctx.stroke();

    ctx.beginPath();
    ctx.arc(this.tx, this.ty, this.targetRad, 0, Math.PI * 2);
    ctx.stroke();
}

function Particle(x, y) {
    this.x = x;
    this.y = y;
    this.shanyu = [];
    this.shanyucount = 10;
    while (this.shanyucount--) {
        this.shanyu.push([this.x, this.y]);
    }

    this.angle = random(0, 2 * Math.PI);
    this.speed = random(1, 10);
    this.mocal = 0.95;
    this.gravity = 0.98;
    this.hue = random(hue - 20, hue + 20);
    this.brightness = random(50, 80);
    this.alpha = 1;
    this.decay = random(0.015, 0.03);
}

Particle.prototype.update = function (index) {
    this.shanyu.pop();
    this.shanyu.unshift([this.x, this.y]);
    this.speed *= this.mocal;
    this.x += Math.cos(this.angle) * this.speed;
    this.y += Math.sin(this.angle) * this.speed + this.gravity;
    this.alpha -= this.decay;
    if (this.alpha <= this.decay) {
        particles.splice(index, 1)
    }
}
Particle.prototype.draw = function () {
    ctx.beginPath();
    ctx.moveTo(this.shanyu[this.shanyu.length - 1][0], this.shanyu[this.shanyu.length - 1][1]);
    ctx.lineTo(this.x, this.y);
    ctx.strokeStyle = 'hsl(' + hue + ',100%,' + this.brightness + '%)';
    ctx.stroke();
}

function createparticals(x, y) {
    var particalcount = 500;
    while (particalcount--) {
        particles.push(new Particle(x, y))
    }
}

var clientw = document.documentElement.clientWidth;
var clienth = document.documentElement.clientHeight;

function loop() {
    requestAnimationFrame(loop);
    hue += 0.5;
    ctx.globalCompositeOperation = 'destination-out';
    ctx.fillRect(0, 0, clientw, clienth);
    ctx.fillStyle = 'rgb(0,0,0,0.5)';
    ctx.globalCompositeOperation = 'lighter';
    var i = fireworks.length;
    while (i--) {
        fireworks[i].draw();
        fireworks[i].update(i);
    }
    var i = particles.length;
    while (i--) {
        particles[i].draw();
        particles[i].update(i);
    }
    if (timerTick >= timerTotal) {
        fireworks.push(new Firework(clientw / 2, clienth, random(0, clientw), random(0, clienth)));
        timerTick = 0;
    } else {
        timerTick++;
    }
}
window.οnlοad = loop();
window.onload = function starttime() {
    ptimer = setTimeout(starttime, 1000);
}
// 音乐控制
unmuteButton.addEventListener('click', function () {
    video.muted = false;
});
unmuteButton2.addEventListener('click', function () {
    video.muted = true;
});

结束喽，下一篇新春特效就是下一年喽！

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标签： 前端 html javascript
本文转载自: https://blog.csdn.net/zhaochen1127/article/details/128694568
版权归原作者 Aic山鱼 所有， 如有侵权，请联系我们删除。
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