前言：
而今我们对“html5设置背景图片”大约比较关切，小伙伴们都想要了解一些“html5设置背景图片”的相关知识。那么小编在网络上收集了一些对于“html5设置背景图片””的相关资讯，希望看官们能喜欢，我们快快来了解一下吧！本次为大家分享的是一款最近多人使用的纯HTML代码动画页面源码。
NAME：HTML5模糊的圆点背景动画特效
小编觉得当做网站背景图肯定很高大尚！
下面就来欣赏一下效果图吧！
注意！前方高能代码！
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>PHP学习群：646724664</title>
<style>
body {
background: #000;
overflow: hidden;
}
canvas {
bottom: 0;
left: 0;
position: absolute;
right: 0;
top: 0;
}
#c1 {
opacity: 0;
}
#c2 {
background: #000;
}
</style>
</head>
<body>
<canvas id="c1"></canvas>
<canvas id="c2"></canvas>
<script>
var c1 = document.getElementById( 'c1' ),
ctx1 = c1.getContext( '2d' ),
c2 = document.getElementById( 'c2' ),
ctx2 = c2.getContext( '2d' ),
twopi = Math.PI * 2,
parts = [],
sizeBase,
cw,
opt,
hue,
count;
function rand( min, max ) {
return Math.random() * ( max - min ) + min;
}
function hsla( h, s, l, a ) {
return 'hsla(' + h + ',' + s + '%,' + l + '%,' + a + ')';
}
function create() {
sizeBase = cw + ch;
count = Math.floor( sizeBase * 0.3 ),
hue = rand( 0, 360 ),
opt = {
radiusMin: 1,
radiusMax: sizeBase * 0.04,
blurMin: 10,
blurMax: sizeBase * 0.04,
hueMin: hue,
hueMax: hue + 100,
saturationMin: 10,
saturationMax: 70,
lightnessMin: 20,
lightnessMax: 50,
alphaMin: 0.1,
alphaMax: 0.5
}
ctx1.clearRect( 0, 0, cw, ch );
ctx1.globalCompositeOperation = 'lighter';
while( count-- ) {
var radius = rand( opt.radiusMin, opt.radiusMax ),
blur = rand( opt.blurMin, opt.blurMax ),
x = rand( 0, cw ),
y = rand( 0, ch ),
hue = rand(opt.hueMin, opt.hueMax ),
saturation = rand( opt.saturationMin, opt.saturationMax ),
lightness = rand( opt.lightnessMin, opt.lightnessMax ),
alpha = rand( opt.alphaMin, opt.alphaMax );
ctx1.shadowColor = hsla( hue, saturation, lightness, alpha );
ctx1.shadowBlur = blur;
ctx1.beginPath();
ctx1.arc( x, y, radius, 0, twopi );
ctx1.closePath();
ctx1.fill();
}
parts.length = 0;
for( var i = 0; i < Math.floor( ( cw + ch ) * 0.03 ); i++ ) {
parts.push({
radius: rand( 1, sizeBase * 0.03 ),
x: rand( 0, cw ),
y: rand( 0, ch ),
angle: rand( 0, twopi ),
vel: rand( 0.1, 0.5 ),
tick: rand( 0, 10000 )
});
}
}
function init() {
resize();
create();
loop();
}
function loop() {
requestAnimationFrame( loop )
ctx2.clearRect( 0, 0, cw, ch );
ctx2.globalCompositeOperation = 'source-over';
ctx2.shadowBlur = 0;
ctx2.drawImage( c1, 0, 0 );
ctx2.globalCompositeOperation = 'lighter';
var i = parts.length;
ctx2.shadowBlur = 15;
ctx2.shadowColor = '#fff';
while( i-- ) {
var part = parts[ i ];
part.x += Math.cos( part.angle ) * part.vel;
part.y += Math.sin( part.angle ) * part.vel;
part.angle += rand( -0.05, 0.05 );
ctx2.beginPath();
ctx2.arc( part.x, part.y, part.radius, 0, twopi );
ctx2.fillStyle = hsla( 0, 0, 100, 0.075 + Math.cos( part.tick * 0.02 ) * 0.05 );
ctx2.fill();
if( part.x - part.radius > cw ) { part.x = -part.radius }
if( part.x + part.radius < 0 ) { part.x = cw + part.radius }
if( part.y - part.radius > ch ) { part.y = -part.radius }
if( part.y + part.radius < 0 ) { part.y = ch + part.radius }
part.tick++;
}
}
function resize() {
cw = c1.width = c2.width = window.innerWidth,
ch = c1.height = c2.height = window.innerHeight;
create();
}
function click() {
create()
}
window.addEventListener( 'resize', resize );
window.addEventListener( 'click', click );
init();</script>
<footer><div style="position:absolute;bottom: 0px;">
<a href="" target="_blank" >粤ICP备17135247号-1</a>
<a href="" target="_blank" ></a></div></footer>
</body>
</html>
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标签： #html5设置背景图片 #backgroundhtml5
