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如何清除HTML5画布的例子。
- <!DOCTYPE HTML>
- <html>
- <head>
- <style>
- body {
- margin: 0px;
- padding: 0px;
- }
- </style>
- </head>
- <body>
- <canvas id="myCanvas" width="600" height="300"></canvas>
- <div id="buttons">
- <input type="button" id="clear" value="Clear the canvas">
- </div>
- <script>
- var canvas = document.getElementById('myCanvas');
- var ctx = canvas.getContext('2d');
- ctx.fillStyle = 'red';
- ctx.beginPath();
- ctx.arc(300, 150, 50, 0 * Math.PI, 2 * Math.PI);
- ctx.fill();
-
- var button = document.getElementById('clear');
-
- button.addEventListener('click', function() {
- ctx.clearRect(0, 0, canvas.width, canvas.height);
- }, false);
-
- </script>
- </body>
- </html>
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发表于 2015-8-17 15:27:41
