基于JavaScript实现新年贺卡特效
作者：java李杨勇
本文介绍了一款超级炫酷的2022新年快乐html网页特效，霓虹的城市夜景和绚烂的烟花很是特别，该html页面还有交互效果，点击鼠标就会呈现烟花绽放的特效。需要的可以参考一下
动图演示
一款超级炫酷的2022新年快乐html网页特效，霓虹的城市夜景和绚烂的烟花很是特别，该html页面还有交互效果，点击鼠标就会呈现烟花绽放的特效，唯美不过如此。图片可以换成自己喜欢的夜景或人物都可以。
主要代码
图片选择引入：
html, body {
margin: 0;
padding: 0;
overflow: hidden;
background: #000;
font-family: Montserrat, sans-serif;
background-image: url(img/pexels-photo-219692.jpeg);
background-size: cover;
background-position: center;
}
css样式
html, body {
margin: 0;
padding: 0;
overflow: hidden;
background: #000;
font-family: Montserrat, sans-serif;
background-image: url(img/pexels-photo-219692.jpeg);
background-size: cover;
background-position: center;
}
canvas {
mix-blend-mode: lighten;
cursor: pointer;
}
#hero {
display: inline;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
mix-blend-mode: color-dodge;
}
#year {
font-size: 30vw;
color: #d0d0d0;
font-weight: bold;
}
#timeleft {
color: #fbfbfb;
font-size: 2.5vw;
text-align: center;
font-family: Lora, serif;
}
Javascirpt
const canvas = document.createElement('canvas'),
context = canvas.getContext('2d'),
width = canvas.width = window.innerWidth,
height = canvas.height = window.innerHeight,
HalfPI = Math.PI / 2,
gravity = vector.create(0, 0.35),
year = document.getElementById('year'),
timeleft = document.getElementById('timeleft'),
newyear = new Date('01/01/2020');
let objects = [],
startFireworks = false,
newYearAlready = false;
function renderTimeLeft() {
let date = new Date();
let delta = Math.abs(newyear - date) / 1000;
let hours = Math.floor(delta / 3600) % 24;
delta -= hours * 3600;
let minutes = Math.floor(delta / 60) % 60;
delta -= minutes * 60;
let seconds = Math.floor(delta % 60) + 1;
let string = '';
let DaysLeft = Math.floor((newyear - date) / (1000 * 60 * 60 * 24)),
HoursLeft = `${hours} ${hours > 1 ? 'hours' : 'hour'}`,
MinutesLeft = `${minutes} ${minutes > 1 ? 'minutes' : 'minute'}`,
SecondsLeft = `${seconds} ${seconds > 1 ? 'seconds' : 'second'}`;
if (hours > 0) string = `${HoursLeft} & ${MinutesLeft}`;else
if (minutes > 0) string = `${MinutesLeft} & ${SecondsLeft}`;else
string = `${SecondsLeft}`;
if (DaysLeft > 0) string = DaysLeft + ' days, ' + string;
string += ' until 2020';
timeleft.innerHTML = string;
}
renderTimeLeft();
setInterval(function () {
let date = new Date();
if (date >= newyear) {
if (!newYearAlready) {
year.innerHTML = '2022';
startFireworks = true;
timeleft.innerHTML = 'Happy New Year!';
}
newYearAlready = true;
} else renderTimeLeft();
}, 500);
document.body.appendChild(canvas);
function random255() {
return Math.floor(Math.random() * 100 + 155);
}
function randomColor() {
let r = random255(),
g = random255(),
b = random255();
return `rgb(${r}, ${g}, ${b})`;
}
class PhysicsBody {
constructor() {
objects.push(this);
}
PhysicsUpdate() {
this.lastPosition = this.position.duplicate();
this.position.addTo(this.velocity);
this.velocity.addTo(gravity);
}
deleteObject() {
objects[objects.indexOf(this)] = undefined;
}}
class firework extends PhysicsBody {
constructor() {
super();
this.position = vector.create(Math.random() * width, height);
let Velocity = vector.create(0, 0);
Velocity.setLength(Math.random() * 10 + 15);
Velocity.setAngle(Math.PI * 1.35 + Math.random() * Math.PI * 0.30);
this.velocity = Velocity;
this.trail = Math.floor(Math.random() * 4) != 1;
this.trailColor = this.trail ? randomColor() : undefined;
this.trailWidth = 2;
this.TimeCreated = new Date().getTime();
this.TimeExpired = this.TimeCreated + (Math.random() * 5 + 7) * 100;
this.BlastParticleCount = Math.floor(Math.random() * 50) + 25;
this.funky = Math.floor(Math.random() * 5) == 1;
this.exposionColor = randomColor();
}
draw() {
context.strokeStyle = this.trailColor;
context.lineWidth = this.trailWidth;
let p = this.position,
lp = this.lastPosition;
context.beginPath();
context.moveTo(lp.getX(), lp.getY());
context.lineTo(p.getX(), p.getY());
context.stroke();
}
funkyfire() {
var funky = this.funky;
for (var i = 0; i < Math.floor(Math.random() * 10); i++) {
new BlastParticle({ firework: this, funky });
}
}
explode() {
var funky = this.funky;
for (var i = 0; i < this.BlastParticleCount; i++) {
new BlastParticle({ firework: this, funky });
}
this.deleteObject();
}
checkExpire() {
let now = new Date().getTime();
if (now >= this.TimeExpired) this.explode();
}
render() {
if (this.trail) this.draw();
if (this.funky) this.funkyfire();
this.checkExpire();
}}
class BlastParticle extends PhysicsBody {
constructor({ firework, funky }) {
super();
this.position = firework.position.duplicate();
let Velocity = vector.create(0, 0);
if (!this.funky) {
Velocity.setLength(Math.random() * 6 + 2);
Velocity.setAngle(Math.random() * Math.PI * 2);
} else {
Velocity.setLength(Math.random() * 3 + 1);
Velocity.setAngle(firework.getAngle + Math.PI / 2 - Math.PI * 0.25 + Math.PI * .5);
}
this.velocity = Velocity;
this.color = firework.exposionColor;
this.particleSize = Math.random() * 4;
this.TimeCreated = new Date().getTime();
this.TimeExpired = this.TimeCreated + (Math.random() * 4 + 3.5) * 100;
}
draw() {
context.strokeStyle = this.color;
context.lineWidth = this.particleSize;
let p = this.position,
lp = this.lastPosition;
context.beginPath();
context.moveTo(lp.getX(), lp.getY());
context.lineTo(p.getX(), p.getY());
context.stroke();
}
checkExpire() {
let now = new Date().getTime();
if (now >= this.TimeExpired) this.deleteObject();
}
render() {
this.draw();
this.checkExpire();
}}
document.body.addEventListener('mousedown', function (e) {
let color = randomColor();
for (var i = 0; i < Math.floor(Math.random() * 20) + 25; i++) {
new BlastParticle({
firework: {
position: vector.create(e.pageX, e.pageY),
velocity: vector.create(0, 0),
exposionColor: color },
funky: false });
}
});
setInterval(function () {
if (!startFireworks) return;
for (var i = 0; i < Math.floor(Math.random() * 4); i++) {
new firework();
}
}, 500);
function cleanupObjects() {
objects = objects.filter(o => o != undefined);
}
function loop() {
context.fillStyle = 'rgba(0,0,0,0.085)';
context.fillRect(0, 0, width, height);
let unusedObjectCount = 0;
objects.map(o => {
if (!o) {unusedObjectCount++;return;}
o.PhysicsUpdate();
o.render();
});
if (unusedObjectCount > 100) cleanupObjects();
requestAnimationFrame(loop);
}
loop();
到此这篇关于基于JavaScript实现新年贺卡特效的文章就介绍到这了,更多相关JavaScript新年贺卡特效内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家！