代码：
<!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 ></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> </div> </html>