一个用Canvas做的“计时器”
很久没有发代码了。发一个用HTML 5 Canvas做的简单计时器……
<html>
<head>
<title>A clock</title>
<script type="text/javascript">
var clock = 0;
window.onload = function () {
setInterval(drawClock, 1000);
}
function drawClock() {
var canvas = document.getElementById('drawing');
if (canvas.getContext){
ctx = canvas.getContext('2d');
ctx.lineWidth = 5;
// clear the drawing place.
ctx.strokeStyle = "rgba(0, 0, 0, 1)";
ctx.beginPath();
ctx.arc(200, 50, 50, 0, Math.PI * 2, true);
ctx.stroke();
// start another drawing.
ctx.lineCap = 'round';
ctx.strokeStyle = "rgba(0, 250, 0, 0.8)";
ctx.beginPath();
ctx.arc(200, 50, 50, 0, Math.PI * clock, false);
ctx.stroke();
}
if (clock >= 2) {
clock = 0;
} else {
clock += 1 / 6;
}
}
</script>
</head>
<body>
<canvas id="drawing" width="800" height="200"></canvas>
</body>
</html>
发现Canvas还是很强大的。
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