利用js中的canvas绘制爱心

js代码如下：

var cav = document.getElementById(\"a\").getContext(\"2d\");function draw(x, y,c){cav.beginPath();cav.fillStyle = c;cav.moveTo(x, y);cav.lineWidth = 3;cav.bezierCurveTo(130 ,65,150,110,100,150);cav.bezierCurveTo(35,85,95,75,100,100);cav.closePath();cav.stroke();cav.fill();