给大家附上一个好玩的动态特效。
在这里插入图片描述

以下是完整的代码,直接copy就ok啦。

<!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>

如果有不懂得童鞋,可以点击链接直接下载源文件提取码:b61v,喜欢的点个赞!!!

Q.E.D.