JS好看的鼠标跟随彩色气泡效果（附代码）

红太狼 2020-06-22 14:02 607阅读 0赞

# JS好看的鼠标跟随彩色气泡效果（附代码）
![](/images/1592834549778.png)

实现代码：

```html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
  
<style>
 *{
 margin:0;padding:0;
 }
 body{overflow:hidden;}
 #canvas{
 background-color:black;
 /*width:100%;
 height:100vh;*/
 }
   
</style>
  
</head>
<body>
  
<canvas id="canvas" ></canvas> 
   
</body>
  
<script>
var canvas = document.querySelector('#canvas');
var ctx = canvas.getContext("2d");
var starlist = [];
function init(){
 canvas.width = window.innerWidth;
 canvas.height = window.innerHeight;
}
init();
window.onresize = init;
  
canvas.addEventListener('mousemove',function(e){
 starlist.push(new Star(e.offsetX,e.offsetY));
 console.log(starlist)
})
  
function random(min,max){
 return Math.floor((max-min)*Math.random()+ min);
}
  
function Star(x,y){
 this.x = x;
 this.y = y;
 this.vx = (Math.random()-0.5)*3;
 this.vy = (Math.random()-0.5)*3;
 this.color = 'rgb('+random(0,256)+','+random(0,256)+','+random(0,256)+')';
 this.a = 1;
 console.log(this.color);
 this.draw();
}
Star.prototype={
 draw:function(){
 ctx.beginPath();
 ctx.fillStyle = this.color;
 ctx.globalCompositeOperation='lighter'
 ctx.globalAlpha= this.a;
 ctx.arc(this.x,this.y,30,0,Math.PI*2,false);
 ctx.fill();
 this.updata();
 },
 updata(){
 this.x+=this.vx;
 this.y+=this.vy;
 this.a*=0.98;
 }
}
console.log(new Star(150,200));
function render(){
 ctx.clearRect(0,0,canvas.width,canvas.height)
   
 starlist.forEach((item,i)=>{
 item.draw();
 if(item.a<0.05){
 starlist.splice(i,1);
 }
 })
   
 requestAnimationFrame(render);
}
render(); 
  
</script>
<div style="text-align:center;">
</div>
  
</html>
```