我一直在嘗試這個 udemy 專案，一旦答案正確，我想放一些五彩紙屑影片。但是，影片在我螢屏的底部進行。如何移動整個螢屏主體上的五彩紙屑？
我在下面附上了它執行時的樣子和五彩紙屑部分的js代碼。謝謝！
五彩紙屑影片圖片
請參閱代碼以供參考：
顯示代碼片段
let maxParticleCount = 150; //set max confetti count
let particleSpeed = 2; //set the particle animation speed
let startConfetti; //call to start confetti animation
let stopConfetti; //call to stop adding confetti
let toggleConfetti; //call to start or stop the confetti animation depending on whether it's already running
let removeConfetti; //call to stop the confetti animation and remove all confetti immediately
(function () {
startConfetti = startConfettiInner;
stopConfetti = stopConfettiInner;
toggleConfetti = toggleConfettiInner;
removeConfetti = removeConfettiInner;
let colors = [
'DodgerBlue',
'OliveDrab',
'Gold',
'Pink',
'SlateBlue',
'LightBlue',
'Violet',
'PaleGreen',
'SteelBlue',
'SandyBrown',
'Chocolate',
'Crimson',
];
let streamingConfetti = false;
let animationTimer = null;
let particles = [];
let waveAngle = 0;
function resetParticle(particle, width, height) {
particle.color = colors[(Math.random() * colors.length) | 0];
particle.x = Math.random() * width;
particle.y = Math.random() * height - height;
particle.diameter = Math.random() * 10 5;
particle.tilt = Math.random() * 10 - 10;
particle.tiltAngleIncrement = Math.random() * 0.07 0.05;
particle.tiltAngle = 0;
return particle;
}
function startConfettiInner() {
let width = window.innerWidth;
let height = window.innerHeight;
window.requestAnimFrame = (function () {
return (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function (callback) {
return window.setTimeout(callback, 16.6666667);
}
);
})();
let canvas = document.getElementById('confetti-canvas');
if (canvas === null) {
canvas = document.createElement('canvas');
canvas.setAttribute('id', 'confetti-canvas');
canvas.setAttribute(
'style',
'display:block;z-index:999999;pointer-events:none'
);
document.body.appendChild(canvas);
canvas.width = width;
canvas.height = height;
window.addEventListener(
'resize',
function () {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
},
true
);
}
let context = canvas.getContext('2d');
while (particles.length < maxParticleCount)
particles.push(resetParticle({}, width, height));
streamingConfetti = true;
if (animationTimer === null) {
(function runAnimation() {
context.clearRect(0, 0, window.innerWidth, window.innerHeight);
if (particles.length === 0) animationTimer = null;
else {
updateParticles();
drawParticles(context);
animationTimer = requestAnimFrame(runAnimation);
}
})();
}
}
function stopConfettiInner() {
streamingConfetti = false;
}
function removeConfettiInner() {
stopConfetti();
particles = [];
}
function toggleConfettiInner() {
if (streamingConfetti) stopConfettiInner();
else startConfettiInner();
}
function drawParticles(context) {
let particle;
let x;
for (let i = 0; i < particles.length; i ) {
particle = particles[i];
context.beginPath();
context.lineWidth = particle.diameter;
context.strokeStyle = particle.color;
x = particle.x particle.tilt;
context.moveTo(x particle.diameter / 2, particle.y);
context.lineTo(x, particle.y particle.tilt particle.diameter / 2);
context.stroke();
}
}
function updateParticles() {
let width = window.innerWidth;
let height = window.innerHeight;
let particle;
waveAngle = 0.01;
for (let i = 0; i < particles.length; i ) {
particle = particles[i];
if (!streamingConfetti && particle.y < -15) particle.y = height 100;
else {
particle.tiltAngle = particle.tiltAngleIncrement;
particle.x = Math.sin(waveAngle);
particle.y =
(Math.cos(waveAngle) particle.diameter particleSpeed) * 0.5;
particle.tilt = Math.sin(particle.tiltAngle) * 15;
}
if (particle.x > width 20 || particle.x < -20 || particle.y > height) {
if (streamingConfetti && particles.length <= maxParticleCount)
resetParticle(particle, width, height);
else {
particles.splice(i, 1);
i--;
}
}
}
}
})();@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@600&display=swap');
* {
margin: 0;
padding: 0;
box-sizing: inherit;
user-select: none;
}
html {
font-size: 62.5%;
box-sizing: border-box;
}
body {
font-family: 'Orbitron', sans-serif;
letter-spacing: 4px;
color: #eee;
background-color: #222;
/* background-color: #60b347; */
}
/* LAYOUT */
header {
position: relative;
height: 35vh;
border-bottom: 7px solid #eee;
}
main {
height: 65vh;
color: #eee;
display: flex;
align-items: center;
justify-content: space-around;
}
.left {
width: 52rem;
display: flex;
flex-direction: column;
align-items: center;
}
.right {
width: 52rem;
font-size: 2rem;
}
/* ELEMENTS STYLE */
h1 {
font-size: 6rem;
letter-spacing: 2px;
text-align: center;
position: absolute;
width: 100%;
top: 52%;
left: 50%;
transform: translate(-50%, -50%);
}
.number {
background: #eee;
color: #333;
font-size: 6rem;
width: 15rem;
padding: 3rem 0rem;
text-align: center;
position: absolute;
bottom: 0;
left: 50%;
transform: translate(-50%, 50%);
}
.between {
font-size: 1.4rem;
position: absolute;
top: 2rem;
right: 2rem;
}
.again {
position: absolute;
top: 2rem;
left: 2rem;
}
.guess {
background: none;
border: 4px solid #eee;
font-family: inherit;
color: inherit;
font-size: 5rem;
padding: 2rem;
width: 22rem;
text-align: center;
display: block;
margin-bottom: 3rem;
}
.btn {
border: none;
background-color: #eee;
color: #222;
font-size: 2rem;
font-family: inherit;
padding: 2rem 3rem;
cursor: pointer;
}
.btn:hover {
background-color: #ccc;
}
.message {
margin-bottom: 8rem;
height: 3rem;
letter-spacing: 4px;
}
.label-score {
margin-bottom: 2rem;
}<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<link rel="stylesheet" href="style.css" />
<title>Guess My Number!</title>
</head>
<body>
<script src="confetti.js"></script>
<header>
<h1>Guess My Number!</h1>
<p class="between">(Between 1 and 20)</p>
<button class="btn again">Again!</button>
<div class="number">?</div>
</header>
<main>
<section class="left">
<input type="number" class="guess" />
<button class="btn check">Check!</button>
</section>
<section class="right">
<p class="message">Start guessing...</p>
<p class="label-score">?? Score: <span class="score">15</span></p>
<p class="label-highscore">
?? Highscore: <span class="highscore">0</span>
</p>
</section>
</main>
<script src="script.js"></script>
</body>
</html>uj5u.com熱心網友回復：
我看到在您的 html 代碼中，您沒有 canvas 元素，而是在 js 代碼中創建它，如下所示：
canvas = document.createElement('canvas');
// ...
document.body.appendChild(canvas);
此代碼canvas在末尾添加元素body：
<body>
<header>...</header>
<main>...</main>
<canvas >
</body>
在您的 css 中，您沒有此特定畫布的樣式，因此它會按照正常的塊元素 css 規則放置在headerandmain元素（您在 css 中有樣式）下方。
因此，您的解決方案是將其添加到 style.css：
#confetti-canvas {
top: 0;
position: absolute;
}
這將使五彩紙屑畫布從螢屏頂部開始并絕對定位（通常對于這種疊加層，您希望具有絕對定位）。
轉載請註明出處，本文鏈接：https://www.uj5u.com/yidong/488228.html
標籤：javascript 动画