tryjsref_canvas_access 在线代码实例

实例代码( Tip: 登录后体验更佳 )
运行代码

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>W3Cschool教程(w3cschool.cn)</title>
</head>
<body>
<h3>访问 CANVAS 元素</h3>
<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
您的浏览器不支持 HTML5 canvas 标签。</canvas>
<p>点击按钮在画布上绘图。</p>
<button onclick="myFunction()">尝试一下</button>
<script>
function myFunction(){
    var c=document.getElementById("myCanvas");
    var ctx=c.getContext("2d");
    ctx.fillStyle="#FF0000";
    ctx.fillRect(20,20,150,100);
}
</script>
</body>
</html>
 
 
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运行结果
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