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html滿屏愛心代碼

林雅南2年前8瀏覽0評論

HTML代碼可以創建出各種不同的效果,其中滿屏愛心代碼是一種非常有趣的代碼,在網頁上展示出一屏幕滿滿的紅色愛心。

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>滿屏愛心</title>
</head>
<body>
<div style="position: absolute;left: 0;top: 0;width: 100%;height: 100%;overflow: hidden;">
<span style="color: red;font-size: 20px;">
<!-- 心形字符 --> &hearts; <!-- 心形字符 -->
</span>
</div>
<script>
// 粒子數量
var particleCount = 50;
// 粒子尺寸
var particleSize = 20;
// 最大速度
var maxSpeed = 3;
// 最大距離
var maxDistance = 100;
var canvas = document.createElement('canvas');
document.body.appendChild(canvas);
function Particle(startX, startY, size) {
this.x = startX;
this.y = startY;
this.size = size;
this.speedX = (Math.random() - 0.5) * maxSpeed;
this.speedY = (Math.random() - 0.5) * maxSpeed;
}
Particle.prototype.move = function() {
this.x += this.speedX;
this.y += this.speedY;
}
function getRandomOffset() {
return (Math.random() - 0.5) * maxDistance;
}
function getRandomSize() {
return particleSize + (Math.random() - 0.5) * 10;
}
var particles = [];
for (var i = 0; i< particleCount; i++) {
particles.push(new Particle(0, 0, getRandomSize()));
}
function draw() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
var center_x = canvas.width / 2;
var center_y = canvas.height / 2;
for (var i = 0; i< particles.length; i++) {
var particle = particles[i];
var particle_x = center_x + particle.x + getRandomOffset();
var particle_y = center_y + particle.y + getRandomOffset();
canvas.getContext('2d').fillRect(particle_x, particle_y, particle.size, particle.size);
}
}
setInterval(function() {
canvas.getContext('2d').clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i< particles.length; i++) {
particles[i].move();
}
draw();
}, 30);
</script>
</body>
</html>

這段代碼中,基本的滿屏愛心效果是通過HTML中的字符實現的,通過定位讓其鋪滿整個屏幕。在JavaScript中,定義了粒子的數量、大小、速度以及最大距離,通過創建粒子實例來隨機生成這些屬性。在每一次重繪畫布時,進行粒子的移動、修改顏色、大小等屬性,并利用canvas畫布進行實現。