一款酷炫的前端动态页面

废话不多说 ，分享一款酷炫的页面动态背景 效果见下图。

查看  demo

背景图效果：

实例效果

点击效果：

背景css

*{

margin: 0;

padding: 0;

}

#canvas{

position: fixed;

background: #ccc;

overflow: auto;

z-index: -1;

}

背景html

背景js

window.requestAnimationFrame = (function(){

return window.requestAnimationFrame ||

window.webkitRequestAnimationFrame ||

window.mozRequestAnimationFrame ||

function( callback ){

window.setTimeout( callback, 1000/2 );

};

})();

var myCanvas = document.getElementById("canvas");

var ctx = myCanvas.getContext("2d");//getContext 设置画笔

var num;

var w,h;

var duixiang = [];

var move = {};

function widthheight(){

w = myCanvas.width = window.innerWidth;

h = myCanvas.height = window.innerHeight;

num= Math.floor(w*h*0.00028);//点的数量。根据屏幕大小确定

for(var i = 0;i < num;i++){

duixiang[i] = {

x:Math.random()*w,

y:Math.random()*h,

cX:Math.random()*0.6-0.3,

cY:Math.random()*0.6-0.3,

R:Math.floor(Math.random()*5)+2,

//CC:Math.floor(Math.random()*3)+2,

r: Math.floor(Math.random() * 254),

g: Math.floor(Math.random() * 254),

b:Math.floor(Math.random() * 254)

}

// console.log(duixiang[i])

Cricle(duixiang[i].x,duixiang[i].y,duixiang[i].R,duixiang[i].r,duixiang[i].g,duixiang[i].b);

//Cricle(duixiang[i].x,duixiang[i].y,duixiang[i].R,duixiang[i].CC);

}

};widthheight();//获取浏览器的等宽度等高

function Cricle(x,y,R,r,g,b){

ctx.save();//保存路径

if(Math.random()>0.991) {ctx.globalAlpha= 0.9;}//ctx.fillStyle = "#CCC";}//填充的背景颜色

else { ctx.globalAlpha=0.47;}

ctx.fillStyle = "rgb("+ r +","+ g +","+ b +")";

ctx.beginPath();//开始绘画

ctx.arc(x,y,R,Math.PI*2,0);//绘画圆 x y 半径(大小) 角度 一个PI 是180 * 2 = 360 真假 0/1 true/false

ctx.closePath();//结束绘画

ctx.fill();//填充背景颜色

ctx.restore();//回复路径

};Cricle();

!function draw(){

ctx.clearRect(0,0,w,h)//先清除画布上的点

for(var i = 0;i < num;i++){

duixiang[i].x += duixiang[i].cX;

duixiang[i].y += duixiang[i].cY;

if(duixiang[i].x>w || duixiang[i].x<0){

duixiang[i].cX = -duixiang[i].cX;

}

if(duixiang[i].y>h || duixiang[i].y<0){

duixiang[i].cY = -duixiang[i].cY;

}

Cricle(duixiang[i].x,duixiang[i].y,duixiang[i].R,duixiang[i].r,duixiang[i].g,duixiang[i].b);

//勾股定理判断两点是否连线

for(var j = i + 1;j < num;j++){

if( (duixiang[i].x-duixiang[j].x)*(duixiang[i].x-duixiang[j].x)+(duixiang[i].y-duixiang[j].y)*(duixiang[i].y-duixiang[j].y) <= 55*55 ){

line(duixiang[i].x,duixiang[i].y,duixiang[j].x,duixiang[j].y,0,i,j)

}

if(move.x){

if( (duixiang[i].x-move.x)*(duixiang[i].x-move.x)+(duixiang[i].y-move.y)*(duixiang[i].y-move.y) <= 100*100 ){

line(duixiang[i].x,duixiang[i].y,move.x,move.y,1,i,1)

}

}

}

}

window.requestAnimationFrame(draw)

}();

//绘制线条

function line(x1,y1,x2,y2,flag,i,j){

if (flag){var color = ctx.createLinearGradient(x1,y1,x2,y2);

ctx.globalAlpha=0.5;

color.addColorStop(0,"rgb("+ duixiang[i].r +","+ duixiang[i].g +","+ duixiang[i].b +")");

color.addColorStop(0.8,"#019ee5");

}

else

{

var color = ctx.createLinearGradient(x1,y1,x2,y2);

ctx.globalAlpha=0.9;

color.addColorStop(0,"rgb("+ duixiang[i].r +","+ duixiang[i].g +","+ duixiang[i].b +")");

color.addColorStop(1,"rgb("+ duixiang[j].r +","+ duixiang[j].g +","+ duixiang[j].b +")");

}

ctx.save();

ctx.strokeStyle = color;

ctx.lineWidth = 0.5;

ctx.beginPath();

ctx.moveTo(x1,y1);

ctx.lineTo(x2,y2);

ctx.stroke();

//ctx.restore();

}

//document.onmousemove = function(e){

// move.x = e.clientX;

// move.y = e.clientY;

//}

//console.log(move)//去掉注释 ，可以与背景互动

window.onresize = function(){

location.reload();

}

点击效果CSS

#canvas1 {

position: fixed;

pointer-events:none;//鼠标多层响应事件

width: 100%;

height: 100%;

overflow: auto;

z-index: 999;

}

点击效果HTML

点击效果js

var _createClass = function () {function defineProperties(target, props)

{ for (var i = 0; i < props.length; i++)

{var descriptor = props[i];descriptor.enumerable = descriptor.enumerable || false;descriptor.configurable = true;if ("value" in descriptor)

descriptor.writable = true;Object.defineProperty(target, descriptor.key, descriptor);}}

return function (Constructor, protoProps, staticProps)

{if (protoProps) defineProperties(Constructor.prototype, protoProps);

if (staticProps) defineProperties(Constructor, staticProps);

return Constructor;};}();function _classCallCheck(instance, Constructor)

{if (!(instance instanceof Constructor)) {throw new TypeError("Cannot call a class as a function");}}

var getRandom = function getRandom(min, max) {

return Math.random() * (max - min) + min;

};

var getRandomInt = function getRandomInt(min, max) {

return Math.floor(Math.random() * (max - min)) + min;

};

var getRandomColor = function getRandomColor() {

var colors = [

'rgba(231, 76, 60, 1)', // red

'rgba(241, 196, 15, 1)', // yellow

'rgba(46, 204, 113, 1)', // green

'rgba(52, 152, 219, 1)', // blue

'rgba(155, 89, 182, 1)' // purple

];

return colors[getRandomInt(0, colors.length)];

};

// Particle//粒子模块

var

Particle = function () {

function Particle(system, x, y) {_classCallCheck(this, Particle);

this.system = system;

this.universe = this.system.world.universe;

this.x = x;

this.y = y;

this.color = getRandomColor();

this.life = 1;

this.aging = getRandom(0.990, 0.999); // 0.99, 0.999 || 0.999, 0.9999

this.r = getRandomInt(12, 16);//初始粒子半径范围

this.speed = getRandom(18, 18.5);//粒子爆炸速度范围

this.velocity = [

getRandom(-this.speed, this.speed),

getRandom(-this.speed, this.speed)];

}_createClass(Particle, [{ key: 'update', value: function update(

dt) {

this.life *= this.aging;

if (

this.r < 0.1 ||

this.life === 0 ||

this.x + this.r < 0 ||

this.x - this.r > this.universe.width ||

this.y + this.r < 0 ||

this.y - this.r > this.universe.height)

{

this.system.removeObject(this);

}

this.r *= this.life;

this.x += this.velocity[0];

this.y += this.velocity[1];

} }, { key: 'render', value: function render(

ctx) {

// Main circle //亮圈模块

ctx.fillStyle = this.color;

ctx.beginPath();

ctx.arc(this.x, this.y, this.r*1.2, 0, 2 * Math.PI, false);

ctx.fill();

ctx.closePath();

var r = this.color.match(/([0-9]+)/g)[0];

var g = this.color.match(/([0-9]+)/g)[1];

var b = this.color.match(/([0-9]+)/g)[2];

// Gradient//梯度变化曲线

var spread = 1.5;

var gradient = ctx.createRadialGradient(

this.x, this.y, this.r,

this.x, this.y, this.r * spread);

gradient.addColorStop(0, 'rgba(' + r + ', ' + g + ', ' + b + ', 0.5)');

gradient.addColorStop(1, 'rgba(' + r + ', ' + g + ', ' + b + ', 0)');

ctx.globalCompositeOperation = 'lighter';

ctx.fillStyle = gradient;

ctx.beginPath();

ctx.arc(this.x, this.y, this.r * spread, 0, 2 * Math.PI, false);

ctx.fill();

ctx.closePath();

ctx.globalCompositeOperation = 'source-over';

// Aberration//偏差

var offset = this.r * 0.5;

var color = 'rgba(' + g + ', ' + b + ', ' + r + ', 0.5)';

ctx.globalCompositeOperation = 'lighter';

ctx.fillStyle = color;

ctx.beginPath();

ctx.arc(this.x + offset, this.y + offset, this.r, 0, 2 * Math.PI, false);

ctx.fill();

ctx.closePath();

ctx.globalCompositeOperation = 'source-over';

} }]);return Particle;}();

// Crown //水波纹圈模块

var

Crown = function () {

function Crown(system, x, y) {_classCallCheck(this, Crown);

this.system = system;

this.x = x;

this.y = y;

this.r = getRandomInt(5, 15); // 5, 20 水波纹圈半径范围

this.mod = 1.1;

this.life = 0.5; //水波纹线

this.aging = getRandom(0.830, 0.899);

this.speed = getRandom(8, 9);

this.color = {

r: getRandomInt(236, 242),

g: getRandomInt(70, 80),

b: getRandomInt(50, 70) };

this.angle1 = Math.PI * getRandom(0, 2);

this.angle2 = this.angle1 + Math.PI * getRandom(0.3, 0.4);//水波纹圈完整度

}_createClass(Crown, [{ key: 'update', value: function update(

dt) {

this.life *= this.aging;

if (this.life <= 0.0001) this.system.removeObject(this);

this.r += Math.abs(1 - this.life) * this.speed;

this.x1 = this.x + this.r * Math.cos(this.angle1);

this.y1 = this.y + this.r * Math.sin(this.angle1);

this.angle3 = this.angle1 + (this.angle2 - this.angle1) / 2;

this.x2 = this.x + this.r * this.mod * Math.cos(this.angle3);

this.y2 = this.y + this.r * this.mod * Math.sin(this.angle3);

} }, { key: 'render', value: function render(

ctx) {

var gradient = ctx.createRadialGradient(

this.x, this.y, this.r * 0.9,

this.x, this.y, this.r);

gradient.addColorStop(0, 'rgba(' + this.color.r + ', ' + this.color.g + ', ' + this.color.b + ', ' + this.life + ')');

gradient.addColorStop(1, 'rgba(' + this.color.r + ', ' + this.color.g + ', ' + this.color.b + ', ' + this.life * 0.5 + ')');

ctx.fillStyle = gradient;

ctx.beginPath();

ctx.arc(this.x, this.y, this.r, this.angle1, this.angle2, false);

ctx.quadraticCurveTo(this.x2, this.y2, this.x1, this.y1);

ctx.fill();

ctx.closePath();

} }]);return Crown;}();

// Explosion //爆炸模块

var

Explosion = function () {

function Explosion(world, x, y) {_classCallCheck(this, Explosion);

this.world = world;

this.x = x;

this.y = y;

this.objects = [];

var particles = getRandomInt(10, 30); // 10, 30 amount of particles//爆炸 粒子数量

var crowns = particles * getRandom(0.4, 0.5);

while (crowns-- > 0) {this.addCrown();}

while (particles-- > 0) {this.addParticle();}

}_createClass(Explosion, [{ key: 'update', value: function update(

dt) {

this.objects.forEach(function (obj) {

if (obj) obj.update(dt);

});

if (this.objects.length <= 0) {

this.world.clearExplosion(this);

}

} }, { key: 'render', value: function render(

ctx) {

this.objects.forEach(function (obj) {

if (obj) obj.render(ctx);

});

} }, { key: 'addCrown', value: function addCrown()

{

this.objects.push(new Crown(this, this.x, this.y));

} }, { key: 'addParticle', value: function addParticle()

{

this.objects.push(new Particle(this, this.x, this.y));

} }, { key: 'removeObject', value: function removeObject(

obj) {

var index = this.objects.indexOf(obj);

if (index !== -1) {

this.objects.splice(index, 1);

}

} }]);return Explosion;}();

// World

var

ConfettiWorld = function () {function ConfettiWorld()

{_classCallCheck(this, ConfettiWorld);}_createClass(ConfettiWorld, [{ key: 'init', value: function init()

{

this.objects = [];

window.addEventListener('click', this.explode.bind(this));

// Initial explosion //初始爆炸

var counter = 0;

while (counter-- > 0) {

this.explode({

clientX: window.event.clientX, //getRandomInt(10, this.universe.width) , //this.universe.width / 2,

clientY: window.event.clientY //getRandomInt(10, 50) //this.universe.height / 2

});

}

} }, { key: 'update', value: function update(

dt) {

this.objects.forEach(function (obj) {

if (obj) obj.update(dt);

});

var amount = this.objects.reduce(function (sum, explosion) {

return sum += explosion.objects.length;

}, 0);

} }, { key: 'render', value: function render(

ctx) {

this.objects.forEach(function (obj) {

if (obj) obj.render(ctx);

});

} }, { key: 'explode', value: function explode(

event) {

var x = event.clientX;

var y = event.clientY;

this.objects.push(new Explosion(this, x, y));

} }, { key: 'clearExplosion', value: function clearExplosion(

explosion) {

var index = this.objects.indexOf(explosion);

if (index !== -1) {

this.objects.splice(index, 1);

}

} }]);return ConfettiWorld;}();

// Time

var

Time = function () {

function Time() {_classCallCheck(this, Time);

this.now = 0; // current tick time

this.prev = 0; // prev tick time

this.elapsed = 0; // elapsed time from last tick

this.delta = 0; // time from last update

this.fps = 60; // desired fps

this.step = 1 / 60; // step duration

}_createClass(Time, [{ key: 'update', value: function update(

time) {

this.now = time;

this.elapsed = (this.now - this.prev) / 1000;

this.prev = this.now;

this.delta += this.elapsed;

} }, { key: 'raf', value: function raf(

func) {

window.requestAnimationFrame(func);

} }, { key: 'hasFrames', value: function hasFrames()

{

return this.delta >= this.step;

} }, { key: 'processFrame', value: function processFrame()

{

this.delta -= this.step;

} }]);return Time;}();

// Canvas

var

Universe = function () {

function Universe(element) {_classCallCheck(this, Universe);

this.el = element;

this.ctx = this.el.getContext('2d');

this.pixelRatio = window.devicePixelRatio;

this.time = new Time();

this.worlds = {};

this.world = null; // current state

this.updateSize();

window.addEventListener('resize', this.updateSize.bind(this));

this.addWorld('confetti', ConfettiWorld);

this.setWorld('confetti');

this.start();

}_createClass(Universe, [{ key: 'start', value: function start()

{

this.time.raf(this.tick.bind(this));

} }, { key: 'tick', value: function tick(

time) {

this.time.update(time);

if (this.time.hasFrames()) {

this.update();

this.time.processFrame();

}

this.render();

this.time.raf(this.tick.bind(this));

} }, { key: 'update', value: function update()

{

this.world.update(this.time.step);

} }, { key: 'render', value: function render()

{

var gradient = this.ctx.createLinearGradient(0, 0, this.width, this.height);

this.ctx.clearRect(0, 0, this.width, this.height);

this.world.render(this.ctx);

}

// Helpers 库

}, { key: 'updateSize', value: function updateSize()

{

this.width = window.innerWidth;

this.height = window.innerHeight;

this.el.width = this.width * this.pixelRatio;

this.el.height = this.height * this.pixelRatio;

this.el.style.width = window.innerWidth + 'px';

this.el.style.height = window.innerHeight + 'px';

this.ctx.scale(this.pixelRatio, this.pixelRatio);

} }, { key: 'addWorld', value: function addWorld(

worldName, World) {

this.worlds[worldName] = new World();

this.worlds[worldName].universe = this;

this.worlds[worldName].init();

} }, { key: 'setWorld', value: function setWorld(

worldName) {

this.world = this.worlds[worldName];

} }]);return Universe;}();

// Main

console.clear();

var element = document.querySelector('#canvas1');

window.Canvas= new Universe(element);