今天來總結一個公司用到的一個離子效果功能，這是我在jquery插件庫裡面找到的，但是很久了，網址找不到了，不好意思哈！
鼠標放在頁面上去靠近那些白色線條，越來越多的線條會形成一個球形。
源碼如下：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
html {
width: 100%;
height: 100%;
background-size: cover;
position: relative;
}
body {
background-image: linear-gradient(-225deg, rgba(71, 59, 123, .9) 0%, rgba(53, 132, 167, .9) 51%, rgba(71, 59, 123, .6) 100%);
overflow: hidden;
padding: 0;
margin: 0;
}
#J_dotLine {
display: block;
margin: 0 auto;
}
</style>
</head>
<body>
<canvas id="J_dotLine"></canvas>
<script src="js/jquery.min.js"></script>
<script>
(function (window) {
function Dotline(option) {
this.opt = this.extend({
dom: 'J_dotLine',//画布id
}, option);
this.c = document.getElementById(this.opt.dom);//canvas元素id
this.ctx = this.c.getContext('2d');
this.c.width = 1920;//canvas宽
this.c.height = 1080;//canvas高
this.dotSum = 200;//点的数量
this.radius = 2;//圆点的半径
this.disMax = this.opt.dis * this.opt.dis;//点与点触发连线的间距
this.color = this.color2rgb("#d2e0f2");//设置粒子线颜色
this.dots = [];
//requestAnimationFrame控制canvas动画
var RAF = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) {
window.setTimeout(callback, 1000 / 60);
};
var _self = this;
//增加鼠标效果
var mousedot = { x: null, y: null, label: 'mouse' };
this.c.onmousemove = function (e) {
var e = e || window.event;
mousedot.x = e.clientX - _self.c.offsetLeft;
mousedot.y = e.clientY - _self.c.offsetTop;
};
this.c.onmouseout = function (e) {
mousedot.x = null;
mousedot.y = null;
}
//控制动画
this.animate = function () {
_self.ctx.clearRect(0, 0, _self.c.width, _self.c.height);
_self.drawLine([mousedot].concat(_self.dots));
RAF(_self.animate);
};
}
//合并配置项，es6直接使用obj.assign();
Dotline.prototype.extend = function (o, e) {
for (var key in e) {
if (e[key]) {
o[key] = e[key]
}
}
return o;
};
//设置线条颜色
Dotline.prototype.color2rgb = function (colorStr) {
var red = null,
green = null,
blue = null;
var cstr = colorStr.toLowerCase();//变小写
var cReg = /^#[0-9a-fA-F]{3,6}$/;//确定是16进制颜色码
if (cstr && cReg.test(cstr)) {
if (cstr.length == 4) {
var cstrnew = '#';
for (var i = 1; i < 4; i++) {
cstrnew += cstr.slice(i, i + 1).concat(cstr.slice(i, i + 1));
}
cstr = cstrnew;
}
red = parseInt('0x' + cstr.slice(1, 3));
green = parseInt('0x' + cstr.slice(3, 5));
blue = parseInt('0x' + cstr.slice(5, 7));
}
return red + ',' + green + ',' + blue;
}
//画点
Dotline.prototype.addDots = function () {
var dot;
for (var i = 0; i < this.dotSum; i++) {//参数
dot = {
x: Math.floor(Math.random() * this.c.width) - this.radius,
y: Math.floor(Math.random() * this.c.height) - this.radius,
ax: (Math.random() * 2 - 1) / 1.5,
ay: (Math.random() * 2 - 1) / 1.5
}
this.dots.push(dot);
}
};
//点运动
Dotline.prototype.move = function (dot) {
dot.x += dot.ax;
dot.y += dot.ay;
//点碰到边缘返回
dot.ax *= (dot.x > (this.c.width - this.radius) || dot.x < this.radius) ? -1 : 1;
dot.ay *= (dot.y > (this.c.height - this.radius) || dot.y < this.radius) ? -1 : 1;
//绘制点
this.ctx.beginPath();
this.ctx.arc(dot.x, dot.y, this.radius, 0, Math.PI * 2, true);
this.ctx.stroke();
};
//点之间画线
Dotline.prototype.drawLine = function (dots) {
var nowDot;
var _that = this;
//自己的思路：遍历两次所有的点，比较点之间的距离，函数的触发放在animate里
this.dots.forEach(function (dot) {
_that.move(dot);
for (var j = 0; j < dots.length; j++) {
nowDot = dots[j];
if (nowDot === dot || nowDot.x === null || nowDot.y === null) continue;//continue跳出当前循环开始新的循环
var dx = dot.x - nowDot.x,//别的点坐标减当前点坐标
dy = dot.y - nowDot.y;
var dc = dx * dx + dy * dy;
if (Math.sqrt(dc) > Math.sqrt(_that.disMax)) continue;
// 如果是鼠标，则让粒子向鼠标的位置移动
if (nowDot.label && Math.sqrt(dc) > Math.sqrt(_that.disMax) / 2) {
dot.x -= dx * 0.02;
dot.y -= dy * 0.02;
}
var ratio;
ratio = (_that.disMax - dc) / _that.disMax;
_that.ctx.beginPath();
_that.ctx.lineWidth = ratio / 2;
_that.ctx.strokeStyle = 'rgba(' + _that.color + ',' + parseFloat(ratio + 0.2).toFixed(1) + ')';
_that.ctx.moveTo(dot.x, dot.y);
_that.ctx.lineTo(nowDot.x, nowDot.y);
_that.ctx.stroke();//不描边看不出效果
//dots.splice(dots.indexOf(dot), 1);
}
});
};
//开始动画
Dotline.prototype.start = function () {
var _that = this;
this.addDots();
setTimeout(function () {
_that.animate();
}, 100);
}
window.Dotline = Dotline;
}(window));
//调用
window.onload = function () {
var dotline = new Dotline({
dom: 'J_dotLine',//画布id
cw: 1000,//画布宽
ch: 500,//画布高
ds: 100,//点的个数
r: 0.5,//圆点半径
cl: '#F00',//粒子线颜色
dis: 100//触发连线的距离
}).start();
}
</script>
</body>
</html>效果如下：