变幻线您的浏览器不支持canvas!//全局变量starx=Math.random()*canvas.width;stary=Math.random()*canvas.height;canvas=document.getElementById("canvas");ctx=canvas.getContext("2d");ctx.fillStyle="rgba(0,0,0,.08)";ctx.lineWidth=5;ctx.lineJoin="round";//intfunctionint(){setInterval(render,30);}//renderfunctionrender(){ctx