js判读浏览器是否支持html5的canvas的代码

复制代码 代码如下:

<canvas width=”300” height=”200”>
Your browser does not support the canvas element.
</canvas>
<script type="text/javascript">
var myCanvas = document.getElementById("myCanvas");
if (!myCanvas.getContext)
{
alert("你的浏览器不支持Canvas.");
}
else
{
alert("你的浏览器支持Canvas.");
}
</script>