html5使用canvas绘制一张图片

<canvas id="canvas" width="600" height="500" style="background-color: yellow;"></canvas>
 

复制代码代码如下:
var canvas=document.getElementById("canvas");
var cxt=canvas.getContext("2d");
var img=new Image();
img.src="cat.jpg";
cxt.drawImage(img,10,10,490,382);