清晰的HTML5画布的代码
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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