​东阳网站推广【东阳官网推广哪个效果好】东阳百度竞价推广托管、东阳百度优化推广外包、东阳全网霸屏推广多少钱、东阳网络推广一年大概多少费

新建html文档。

书写hmtl代码。

<canvas id="c" width="1680" height="893"></canvas>

书写css代码。

<style>

* { margin: 0; padding: 0; }

html, body { height: 100%; position: relative; width: 100%; }

body { background: #eee; }

canvas { background: white; display: block; }

#c { left: 50%; position: absolute; top: 50%; transform: translate(-50%, -50%); }

</style>

书写js代码。

<script>

;(function(main) {

var args = {};

window.onload = function() {

main(args);

};

})(function(args) {

'use strict';

var Box = function(x, y, w, h, s) {

this.x = x;

this.y = y;

this.w = w;

this.h = h;

this.s = s;

this.a = Math.random() * Math.PI * 2;

this.hue = Math.random() * 360;

};

Box.prototype = {

constructor: Box,

update: function() {

this.a += Math.random() * 0.5 - 0.25;

this.x += Math.cos(this.a) * this.s;

this.y += Math.sin(this.a) * this.s;

this.hue += 5;

if(this.x > WIDTH) this.x = 0;

else if(this.x < 0) this.x = WIDTH;

if(this.y > HEIGHT) this.y = 0;

else if(this.y < 0) this.y = HEIGHT;

},

render: function(ctx) {

ctx.save();

ctx.fillStyle = 'hsla(' + this.hue + ', 100%, 50%, 1)';

ctx.translate(this.x, this.y);

ctx.rotate(this.a);

ctx.fillRect(-this.w, -this.h / 2, this.w, this.h);

ctx.restore();

}

};

var Circle = function(x, y, tx, ty, r) {

this.x = x;

this.y = y;

this.ox = x;

this.oy = y;

this.tx = tx;

this.ty = ty;

this.lx = x;

this.ly = y;

this.r = r;

this.br = r;

this.a = Math.random() * Math.PI * 2;

this.sx = Math.random() * 0.5;

this.sy = Math.random() * 0.5;

this.o = Math.random() * 1;

this.delay = Math.random() * 200;

this.delayCtr = 0;

this.hue = Math.random() * 360;

};

Circle.prototype = {

constructor: Circle,

update: function() {

if(this.delayCtr < this.delay) {

this.delayCtr++;

return;

}

this.hue += 1;

this.a += 0.1;

this.lx = this.x;

this.ly = this.y;

if(!clickToggle) {

this.x += (this.tx - this.x) * this.sx;

this.y += (this.ty - this.y) * this.sy;

} else {

this.x += (this.ox - this.x) * this.sx;

this.y += (this.oy - this.y) * this.sy;

}

this.r = this.br + Math.cos(this.a) * (this.br * 0.5);

},

render: function(ctx) {

ctx.save();

ctx.globalAlpha = this.o;

ctx.fillStyle = 'hsla(' + this.hue + ', 100%, 50%, 1)';

ctx.translate(this.x, this.y);

ctx.beginPath();

ctx.arc(0, 0, this.r, 0, Math.PI * 2);

ctx.fill();

ctx.restore();

if(clickToggle) {

ctx.save();

ctx.strokeStyle = 'hsla(' + this.hue + ', 100%, 50%, 1)';

ctx.beginPath();

ctx.moveTo(this.lx, this.ly);

ctx.lineTo(this.x, this.y);

ctx.stroke();

ctx.restore();

}

}

};

var txtCanvas = document.createElement('canvas');

var txtCtx = txtCanvas.getContext('2d');

var c = document.getElementById('c');

var ctx = c.getContext('2d');

var WIDTH = c.width = window.innerWidth;

var HEIGHT = c.height = window.innerHeight;

var imgData = null;

var idx = null;

var skip = 4;

var circles = [];

var circle = null;

var a = null;

var clickToggle = false;

var boxList = [];

var box = null;

txtCanvas.width = WIDTH;

txtCanvas.height = HEIGHT;

txtCtx.font = 'bold 70px Sans-serif';

txtCtx.textAlign = 'center';

txtCtx.baseline = 'middle';

txtCtx.fillText('百度经验', WIDTH / 2, HEIGHT / 2);

ctx.font = 'bold 12px Monospace';

ctx.textAlign = 'center';

ctx.baseline = 'middle';

imgData = txtCtx.getImageData(0, 0, WIDTH, HEIGHT).data;

for(var y = 0; y < HEIGHT; y += skip) {

for(var x = 0; x < WIDTH; x += skip) {

idx = (x + y * WIDTH) * 4 - 1;

if(imgData[idx] > 0) {

a = Math.PI * 2 * Math.random();

circle = new Circle(

WIDTH / 2 + Math.cos(a) * WIDTH,

HEIGHT / 2 + Math.sin(a) * WIDTH,

x, 

y,

Math.random() * 4

);

circles.push(circle);

}

}

}

for(var b = 0; b < 10; b++) {

box = new Box(

WIDTH * Math.random(),

HEIGHT * Math.random(),

5,

2,

5 + Math.random() * 5

);

boxList.push(box);

}

c.addEventListener('click', function(e) {

clickToggle = !clickToggle;

});

requestAnimationFrame(function loop() {

requestAnimationFrame(loop);

ctx.globalCompositeOperation = 'source-over';

ctx.fillStyle = 'rgba(0, 0, 0, 0.5)';

ctx.fillRect(0, 0, WIDTH, HEIGHT);

ctx.fillStyle = 'white';

ctx.fillText('CLICK TO TOGGLE', WIDTH / 2, HEIGHT / 2 + 100);

ctx.globalCompositeOperation = 'lighter';

for(var i = 0, len = circles.length; i < len; i++) {

circle = circles[i];

circle.update();

circle.render(ctx);

}

for(var j = 0; j < boxList.length; j++) {

box = boxList[j];

box.update();

box.render(ctx);

}

});

});

</script>

代码整体结构。

查看效果。