实现了一个动态雨滴效果，基于canvas实现，简单而又美丽的元素，总能给人们带来一份清凉和舒适。
实现代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>立体字时钟</title>
<style>
body {
overflow: hidden;
background: black;
}
</style>
</head>
<body>
<canvas id="canvas-club"></canvas>
</body>
<script>
var c = document.getElementById("canvas-club");
var ctx = c.getContext("2d");
var w = c.width = window.innerWidth;
var h = c.height = window.innerHeight;
var clearColor = 'rgba(0, 0, 0, .1)';
var max = 30;
var drops = [];
function random(min, max) {
return Math.random() * (max - min) + min;
}
function O() {}
O.prototype = {
init: function () {
this.x = random(0, w);
this.y = 0;
this.color = 'hsl(180, 100%, 50%)';
this.w = 2;
this.h = 1;
this.vy = random(4, 5);
this.vw = 3;
this.vh = 1;
this.size = 2;
this.hit = random(h * .8, h * .9);
this.a = 1;
this.va = .96;
},
draw: function () {
if (this.y > this.hit) {
ctx.beginPath();
ctx.moveTo(this.x, this.y - this.h / 2);
ctx.bezierCurveTo(
this.x + this.w / 2, this.y - this.h / 2,
this.x + this.w / 2, this.y + this.h / 2,
this.x, this.y + this.h / 2);
ctx.bezierCurveTo(
this.x - this.w / 2, this.y + this.h / 2,
this.x - this.w / 2, this.y - this.h / 2,
this.x, this.y - this.h / 2);
ctx.strokeStyle = 'hsla(180, 100%, 50%, ' + this.a + ')';
ctx.stroke();
ctx.closePath();
} else {
ctx.fillStyle = this.color;
ctx.fillRect(this.x, this.y, this.size, this.size * 5);
}
this.update();
},
update: function () {
if (this.y < this.hit) {
this.y += this.vy;
} else {
if (this.a > .03) {
this.w += this.vw;
this.h += this.vh;
if (this.w > 100) {
this.a *= this.va;
this.vw *= .98;
this.vh *= .98;
}
} else {
this.init();
}
}
}
}
function resize() {
w = c.width = window.innerWidth;
h = c.height = window.innerHeight;
}
function setup() {
for (var i = 0; i < max; i++) {
(function (j) {
setTimeout(function () {
var o = new O();
o.init();
drops.push(o);
}, j * 200)
}(i));
}
}
function anim() {
ctx.fillStyle = clearColor;
ctx.fillRect(0, 0, w, h);
for (var i in drops) {
drops[i].draw();
}
requestAnimationFrame(anim);
}
window.addEventListener("resize", resize);
setup();
anim();
</script>
</HTML>
