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js+canvas簡單繪製圓圈的方法，jscanvas繪製圓圈
本文執行個體講述了js+canvas簡單繪製圓圈的方法。分享給大家供大家參考，具體如下：
運行效果如下：
具體代碼如下：
<!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畫圓圈</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>
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