tryhtml5_canvas_height_width_clear 在线代码实例

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运行代码

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<html>
<head> 
<meta charset="utf-8"> 
<title>W3Cschool(w3cschool.cn)</title> 
</head>
<body>
<canvas id="myCanvas" width="200" height="200" style="border:1px solid">
您的浏览器不支持 HTML5 canvas 标签。
</canvas>
<br>
<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="#92B901";
ctx.fillRect(50,50,100,100);
function clearCanvas()
{
c.height=300;
}
</script>
<button onclick="clearCanvas()">Clear canvas</button>
</body>
</html>
 
 
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运行结果
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