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新建html。

书写html。

<div class="canvas-box">

<canvas id="canvas">你的浏览器不支持canvas</canvas>

</div>

书写css。

<style>

*{margin: 0;padding: 0;}

html,body{height: 100%;}

body{background: linear-gradient(to bottom, #131313 0%,#02101c 100%);}

.canvas-box{position: fixed;left: 0;top: 0;z-index: -1;}

.box{position: absolute;z-index: 10;color:#fff;font-family: Arial;left: 50%;top:50%;transform: translate(-50%,-50%);text-align: center;}

a:link,a:hover,a:visited,a:active{text-decoration: none;color: inherit;display: block;}

a{margin: 30px 0;font-size: 20px;}

</style>

书写js。

<script>

var WINDOW_WIDTH = document.body.offsetWidth;

var WINDOW_HEIGHT = document.body.offsetHeight;

var canvas,context;

var num = 500;

var stars = [];

var mouseX = WINDOW_WIDTH/2;

var mouseY = WINDOW_HEIGHT/2;

var rnd;

window.onload = function(){

canvas = document.getElementById('canvas');

canvas.width = WINDOW_WIDTH;

canvas.height = WINDOW_HEIGHT;

context = canvas.getContext('2d');

addStar();

setInterval(render,33);

liuxing();

// render();

document.body.addEventListener('mousemove',mouseMove);

}

function liuxing(){

var time = Math.round(Math.random()*3000+33);

setTimeout(function(){

rnd = Math.ceil(Math.random()*stars.length)

liuxing();

},time)

}

function mouseMove(e){

mouseX = e.clientX;

mouseY = e.clientY;

}

function render(){

context.fillStyle = 'rgba(0,0,0,0.1)';

context.fillRect(0,0,WINDOW_WIDTH,WINDOW_HEIGHT);

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

var star = stars[i];

if(i == rnd){

star.vx = -5;

star.vy = 20;

context.beginPath();

context.strokeStyle = 'rgba(255,255,255,'+star.alpha+')';

context.lineWidth = star.r;

context.moveTo(star.x,star.y);

context.lineTo(star.x+star.vx,star.y+star.vy);

context.stroke();

context.closePath();

}

star.alpha += star.ra;

if(star.alpha<=0){

star.alpha = 0;

star.ra = -star.ra;

star.vx = Math.random()*0.2-0.1;

star.vy = Math.random()*0.2-0.1;

}else if(star.alpha>1){

star.alpha = 1;

star.ra = -star.ra

}

star.x += star.vx;

if(star.x>=WINDOW_WIDTH){

star.x = 0;

}else if(star.x<0){

star.x = WINDOW_WIDTH;

star.vx = Math.random()*0.2-0.1;

star.vy = Math.random()*0.2-0.1;

}

star.y += star.vy;

if(star.y>=WINDOW_HEIGHT){

star.y = 0;

star.vy = Math.random()*0.2-0.1;

star.vx = Math.random()*0.2-0.1;

}else if(star.y<0){

star.y = WINDOW_HEIGHT;

}

context.beginPath();

var bg = context.createRadialGradient(star.x, star.y, 0, star.x, star.y, star.r);

bg.addColorStop(0,'rgba(255,255,255,'+star.alpha+')')

bg.addColorStop(1,'rgba(255,255,255,0)')

context.fillStyle  = bg;

context.arc(star.x,star.y, star.r, 0, Math.PI*2, true);

context.fill();

context.closePath();

}

}

function addStar(){

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

var aStar = {

x:Math.round(Math.random()*WINDOW_WIDTH),

y:Math.round(Math.random()*WINDOW_HEIGHT),

r:Math.random()*3,

ra:Math.random()*0.05,

alpha:Math.random(),

vx:Math.random()*0.2-0.1,

vy:Math.random()*0.2-0.1

}

stars.push(aStar);

}

}

</script>

特效整体代码结构。

查看效果。