點評：在canvas中當在canvas上寫width和height時為canvas的實際畫板大小，默認情況下width為300px，height為150px,接下來詳細介紹，感興趣的朋友可以參考下
在canvas中當在canvas上寫width和height時為canvas的實際畫板大小，默認情況下width為300px，height為150px。復制代碼
代碼如下:
<!DOCTYPE html>
<head>
<meta charset=utf-8 />
<title>canvas</title>
<script type='text/javascript'>
window.onload = function(){
getCanvas();
};
//canvase繪圖
function getCanvas(){
//獲得canvas元素及其繪圖上下文
var canvas = document.getElementById('canvasId');
var context = canvas.getContext('2d');
//用絕對路標來創建一條路徑
context.beginPath();
context.moveTo(0,200);
context.lineTo(200,0);
//將這條先繪制到canvas上
context.stroke();
}
</script>
</head>
<body>
<canvas ></canvas>
</body>
</html>
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