html5 canvas 画图

1. 画布背景。canvas宽度和高度必须设置。不能设置成比例如：width:100%

<!DOCTYPE HTML>
<html>
<head></head>
<body>

<canvas id="myCanvas"   width="400px" height="200px" style="border:1px solid #c3c3c3;">
Your browser does not support the canvas element.
</canvas>

<div>
<img src="fl1.png" id="f1_img" style="display:none" ></img>
</div>
<script type="text/javascript">
 window.onload=function(){

var c=document.getElementById("myCanvas");
var cxt=c.getContext("2d");
var img = document.getElementById(‘f1_img‘);
cxt.drawImage(img,0,0,c.width,c.height);

};


</script>

</body>
</html>

html5 canvas 画图

相关文章