canvas鼠标跟随彩虹气泡

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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();

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