整站下载工具_哪种公司需要做网站_搜建筑规范的网站_深圳嵌入式培训
JS class Snowflake {constructor() {this.x = 0;this.y = 0;this.vx = 0;this.vy = 0;this.radius = 0;this.alpha = 0;this.reset();}reset() {this.x = this.randBetween(0, window.innerWidth);this.y = this.randBetween(0, -window.innerHeight);this.vx = this.randBetween(-3, 3);this.vy = this.randBetween(2, 5);this.radius = this.randBetween(1, 4);this.alpha = this.randBetween(0.1, 0.9);}randBetween(min, max) {return min + Math.random() * (max - min);}update() {this.x += this.vx;this.y += this.vy;if (this.y + this.radius > window.innerHeight) {this.reset();}}}class Snow {constructor() {this.canvas = document.createElement("canvas");this.ctx = this.canvas.getContext("2d");document.body.appendChild(this.canvas);window.addEventListener("resize", () => this.onResize());this.onResize();this.updateBound = this.update.bind(this);requestAnimationFrame(this.updateBound);this.createSnowflakes();}onResize() {this.width = window.innerWidth;this.height = window.innerHeight;this.canvas.width = this.width;this.canvas.height = this.height;}createSnowflakes() {const flakes = window.innerWidth / 4;this.snowflakes = [];for (let s = 0; s < flakes; s++) {this.snowflakes.push(new Snowflake());}}update() {this.ctx.clearRect(0, 0, this.width, this.height);for (let flake of this.snowflakes) {flake.update();this.ctx.save();this.ctx.fillStyle = "#FFF";this.ctx.beginPath();this.ctx.arc(flake.x, flake.y, flake.radius, 0, Math.PI * 2);this.ctx.closePath();this.ctx.globalAlpha = flake.alpha;this.ctx.fill();this.ctx.restore();}requestAnimationFrame(this.updateBound);}}new Snow();const comingdate = new Date("Feb, 2022 00:00:00");const d = document.getElementById("d");const h = document.getElementById("h");const m = document.getElementById("m");const s = document.getElementById("s");const countdown = setInterval(() => {const now = new Date();const des = comingdate.getTime() - now.getTime();const days = Math.floor(des / (1000 * 60 * 60 * 24));const hours = Math.floor((des % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));const mins = Math.floor((des % (1000 * 60 * 60)) / (1000 * 60));const secs = Math.floor((des % (1000 * 60)) / 1000);d.innerHTML = getTrueNumber(days);h.innerHTML = getTrueNumber(hours);m.innerHTML = getTrueNumber(mins);s.innerHTML = getTrueNumber(secs);if (x <= 0) clearInterval(x);}, 1000);const getTrueNumber = x => (x < 10 ? "0" + x : x);
年货部分
HTML
<!DOCTYPE html>">