html5使用canvas画三角形

<canvas id=canvas width=500 height=500 xss=removed></canvas>  复制代码代码如下: var canvas=document.getElementById(“canvas”); var cxt=canvas.getContext(“2d”); cxt.beginPath(); cxt.moveTo(250,50); cxt.lineTo(200,200); cxt.lineTo(300,300); cxt.closePath();//