JS实现
function drawStar() {
//定义数组，arr存放每个小星星的信息，colour为颜色数组，存几个好看的颜色
var arr = [];
var colours = ["#ffff00", "#66ffff", "#3399ff", "#99ff00", "#ff9900"];
var timeoutList = []; // 计时器列表-用于后续清理计时器
// 创建画布
const canvas = document.createElement('canvas')
document.body.appendChild(canvas)
var ctx = canvas.getContext("2d");
// 让画布自适应窗口大小，这个复制即可
function resizeCanvas() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
}
resizeCanvas();
// 给画布css样式，固定定位，且阻止用户的鼠标事件
canvas.style.cssText = `
position: fixed;
z-index: 1000;
top: 0;
left: 0;
pointer-events: none;
`;
// 封装绘制一个五角星函数
// x是圆心横坐标，y是圆心纵坐标，其实就是鼠标位置（x ，y）
// r是里面小圆半径 ，l是大圆半径
// rot是初始旋转角度
function star(x, y, r, l, rot) {
ctx.beginPath();
// 循环5次，因为5个点
for (let i = 0; i < 5; i++) {
//先绘制小圆上一个点
ctx.lineTo(
Math.cos(((18 + i * 72 - rot) * Math.PI) / 180) * r + x,
-Math.sin(((18 + i * 72 - rot) * Math.PI) / 180) * r + y
);
//连线到大圆上一个点
ctx.lineTo(
Math.cos(((54 + i * 72 - rot) * Math.PI) / 180) * l + x,
-Math.sin(((54 + i * 72 - rot) * Math.PI) / 180) * l + y
);
}
ctx.closePath();
}
// 绘制一堆星星
function draw() {
//循环数组
for (let i = 0; i < arr.length; i++) {
let temp = arr[i];
//调用绘制一个星星函数
star(temp.x, temp.y, temp.r, temp.r * 3, temp.rot);
//星星颜色
ctx.fillStyle = temp.color;
//星星边框颜色
ctx.strokeStyle = temp.color;
//线宽度
ctx.lineWidth = 0.1;
//角有弧度
ctx.lineJoin = "round";
// 填充
ctx.fill();
// 绘制路径
ctx.stroke();
}
}
//更新动画
function update() {
//循环数组
for (let i = 0; i < arr.length; i++) {
// x坐标+dx移动距离
arr[i].x += arr[i].dx;
// y坐标+dy移动距离
arr[i].y += arr[i].dy;
// 加上旋转角度
arr[i].rot += arr[i].td;
// 半径慢慢减小
arr[i].r -= 0.015;
// 当半径小于0时
if (arr[i].r < 0) {
//删除该星星
arr.splice(i, 1);
}
}
}
// 添加当前位置星星数据
function addStarts(e) {
// 每移动触发一次事件给arr数组添加一个星星
arr.push({
// x是初始横坐标
x: e.clientX,
//y是初始纵坐标
y: e.clientY,
//r是星星里面那个小圆半径，哪来的小圆等会说
r: Math.random() * 0.5 + 1.5,
//运动时旋转的角度
td: Math.random() * 4 - 2,
// X轴移动距离
dx: Math.random() * 2 - 1,
// y轴移动距离
dy: Math.random() * 1 + 1,
// 初始的旋转角度
rot: Math.random() * 90 + 90,
// 颜色
color: colours[Math.floor(Math.random() * colours.length)],
});
}
// 监听屏幕变化事件
window.onresize = resizeCanvas;
// 监听鼠标移动事件
window.addEventListener("mousemove", (e) => {
// 添加星星数据
addStarts(e);
//设置100毫秒内效果
for (let index = 0; index < 200; index++) {
if (index === 0 && timeoutList.length > 0) {
for (const timeoutName of timeoutList) {
clearTimeout(timeoutName)
}
}
timeoutList[index] = setTimeout(() => {
//清屏
ctx.clearRect(0, 0, canvas.width, canvas.height);
//绘制
draw();
//更新
update();
}, index * 20);
}
});
}
drawStar()
HTML实现
<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
<span class="js-cursor-container"></span>
<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);
window.addEventListener('resize', onWindowResize);
}
function onWindowResize(e) {
width = window.innerWidth;
height = window.innerHeight;
}
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": "fixed",
"display": "inline-block",
"top": "0px",
"left": "0px",
"pointerEvents": "none",
"touch-action": "none",
"z-index": "10000000",
"fontSize": "25px",
"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 + 10 };
this.initialStyles.color = color;
this.element = document.createElement('span');
this.element.innerHTML = this.character;
applyProperties(this.element, this.initialStyles);
this.update();
document.querySelector('.js-cursor-container').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];
}
}
if (!('ontouchstart' in window || navigator.msMaxTouchPoints)) init();
})();
</script>
</body>
</html>
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