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export function setupCounter(element) {
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let counter = 0
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const setCounter = (count) => {
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counter = count
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element.innerHTML = `count is ${counter}`
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}
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element.addEventListener('click', () => setCounter(counter + 1))
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setCounter(0)
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}
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<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="32" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 256"><path fill="#F7DF1E" d="M0 0h256v256H0V0Z"></path><path d="m67.312 213.932l19.59-11.856c3.78 6.701 7.218 12.371 15.465 12.371c7.905 0 12.89-3.092 12.89-15.12v-81.798h24.057v82.138c0 24.917-14.606 36.259-35.916 36.259c-19.245 0-30.416-9.967-36.087-21.996m85.07-2.576l19.588-11.341c5.157 8.421 11.859 14.607 23.715 14.607c9.969 0 16.325-4.984 16.325-11.858c0-8.248-6.53-11.17-17.528-15.98l-6.013-2.58c-17.357-7.387-28.87-16.667-28.87-36.257c0-18.044 13.747-31.792 35.228-31.792c15.294 0 26.292 5.328 34.196 19.247l-18.732 12.03c-4.125-7.389-8.591-10.31-15.465-10.31c-7.046 0-11.514 4.468-11.514 10.31c0 7.217 4.468 10.14 14.778 14.608l6.014 2.577c20.45 8.765 31.963 17.7 31.963 37.804c0 21.654-17.012 33.51-39.867 33.51c-22.339 0-36.774-10.654-43.819-24.574"></path></svg>
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Before Width: | Height: | Size: 995 B |
136
main.js
136
main.js
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import './style.css'
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import javascriptLogo from './javascript.svg'
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import viteLogo from '/vite.svg'
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import { setupCounter } from './counter.js'
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// 清理默认样式
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document.body.style.margin = 0
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document.body.style.padding = 0
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document.body.style.overflow = 'hidden'
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document.querySelector('#app').innerHTML = `
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<div>
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<a href="https://vitejs.dev" target="_blank">
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<img src="${viteLogo}" class="logo" alt="Vite logo" />
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</a>
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<a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript" target="_blank">
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<img src="${javascriptLogo}" class="logo vanilla" alt="JavaScript logo" />
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</a>
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<h1>Hello Vite!</h1>
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<div class="card">
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<button id="counter" type="button"></button>
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</div>
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<p class="read-the-docs">
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Click on the Vite logo to learn more
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</p>
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</div>
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`
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// 创建一个画布
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const canvas = document.createElement('canvas')
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document.body.appendChild(canvas)
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setupCounter(document.querySelector('#counter'))
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// 画布填满屏幕
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const ctx = canvas.getContext('2d')
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const width = canvas.width = window.innerWidth
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const height = canvas.height = window.innerHeight
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// 画布中心点
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const centerX = width / 2
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const centerY = height / 2
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// 画布中心点的偏移量
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const offsetX = 0
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const offsetY = 0
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// 准备一千个小圆点作为粒子
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const particles = []
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const particleCount = 1000
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// 生成粒子
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for (let i = 0; i < particleCount; i++) {
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particles.push({
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x: Math.random() * width,
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y: Math.random() * height,
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vx: Math.random() * 10 - 5,
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vy: Math.random() * 10 - 5,
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radius: Math.random() * 1 + 1
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})
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}
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// 绘制粒子
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function drawParticles () {
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ctx.fillStyle = '#ff1414'
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for (let i = 0; i < particleCount; i++) {
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const particle = particles[i]
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ctx.beginPath()
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ctx.arc(particle.x, particle.y, particle.radius, 0, Math.PI * 2)
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ctx.fill()
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}
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}
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// 绘制粒子的连线
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function drawParticlesLine () {
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ctx.strokeStyle = '#ff1414'
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for (let i = 0; i < particleCount; i++) {
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const particle = particles[i]
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for (let j = 0; j < particleCount; j++) {
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const otherParticle = particles[j]
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const dx = particle.x - otherParticle.x
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const dy = particle.y - otherParticle.y
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const dist = Math.sqrt(dx * dx + dy * dy)
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if (dist < 100) {
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ctx.beginPath()
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ctx.moveTo(particle.x, particle.y)
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ctx.lineTo(otherParticle.x, otherParticle.y)
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ctx.stroke()
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}
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}
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}
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}
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// 粒子颜色为红色, 大小为 2px
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function drawParticles2 () {
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ctx.fillStyle = '#ff1414'
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for (let i = 0; i < particleCount; i++) {
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const particle = particles[i]
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ctx.beginPath()
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ctx.arc(particle.x, particle.y, 2, 0, Math.PI * 2)
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ctx.fill()
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}
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}
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// 将粒子的位置更新到下一帧
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function updateParticles () {
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for (let i = 0; i < particleCount; i++) {
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const particle = particles[i]
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particle.x += particle.vx
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particle.y += particle.vy
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if (particle.x < 0) {
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particle.x = width
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}
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if (particle.x > width) {
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particle.x = 0
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}
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if (particle.y < 0) {
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particle.y = height
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}
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if (particle.y > height) {
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particle.y = 0
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}
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}
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}
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// 清空画布
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function clear () {
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ctx.clearRect(0, 0, width, height)
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}
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// 绘制
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function draw () {
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clear()
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drawParticles()
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drawParticlesLine()
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updateParticles()
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requestAnimationFrame(draw)
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}
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// 开始绘制
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draw()
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97
style.css
97
style.css
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:root {
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font-family: Inter, system-ui, Avenir, Helvetica, Arial, sans-serif;
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line-height: 1.5;
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font-weight: 400;
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color-scheme: light dark;
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color: rgba(255, 255, 255, 0.87);
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background-color: #242424;
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font-synthesis: none;
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text-rendering: optimizeLegibility;
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-webkit-font-smoothing: antialiased;
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-moz-osx-font-smoothing: grayscale;
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-webkit-text-size-adjust: 100%;
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}
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a {
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font-weight: 500;
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color: #646cff;
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text-decoration: inherit;
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}
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a:hover {
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color: #535bf2;
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}
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body {
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margin: 0;
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display: flex;
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place-items: center;
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min-width: 320px;
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min-height: 100vh;
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}
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h1 {
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font-size: 3.2em;
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line-height: 1.1;
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}
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#app {
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max-width: 1280px;
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margin: 0 auto;
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padding: 2rem;
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text-align: center;
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}
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.logo {
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height: 6em;
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padding: 1.5em;
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will-change: filter;
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transition: filter 300ms;
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}
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.logo:hover {
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filter: drop-shadow(0 0 2em #646cffaa);
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}
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.logo.vanilla:hover {
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filter: drop-shadow(0 0 2em #f7df1eaa);
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}
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.card {
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padding: 2em;
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}
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.read-the-docs {
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color: #888;
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}
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button {
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border-radius: 8px;
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border: 1px solid transparent;
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padding: 0.6em 1.2em;
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font-size: 1em;
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font-weight: 500;
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font-family: inherit;
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background-color: #1a1a1a;
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cursor: pointer;
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transition: border-color 0.25s;
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}
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button:hover {
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border-color: #646cff;
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}
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button:focus,
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button:focus-visible {
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outline: 4px auto -webkit-focus-ring-color;
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}
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@media (prefers-color-scheme: light) {
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:root {
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color: #213547;
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background-color: #ffffff;
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}
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a:hover {
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color: #747bff;
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}
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button {
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background-color: #f9f9f9;
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}
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}
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