js+canvas简单绘制圆圈的方法
本文实例讲述了js+canvas简单绘制圆圈的方法。分享给大家供大家参考，具体如下：
运行效果截图如下：
具体代码如下：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>canvas画圆圈</title>
<script type="text/javascript" >
function drawCircle(id){
var canvas = document.getElementById(id);
if(canvas ) {
var context = canvas.getContext("2d");
context.fillStyle = "gray";
context.strokeStyle = "black";
context.fillRect(0, 0, 400, 400);
context.beginPath();
context.arc(100, 100, 50, 0, Math.PI*2, true);
context.closePath();
context.fillStyle = "green";
context.fill();
} else {
return;
}
}
window.onload = function () {
drawCircle("canvas");
}
</script>
</head>
<body>
<canvas id="canvas" width="400" style="background:red;" height="400"></canvas>
<hr />
</body>
</html>更多关于JavaScript相关内容感兴趣的读者可查看本站专题：《JavaScript动画特效与技巧汇总》及《JavaScript运动效果与技巧汇总》
希望本文所述对大家JavaScript程序设计有所帮助。
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