26.canvas自定义填充.html

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>canvas自定义填充</title>
	<style type="text/css">
		*{
			padding: 0;
			margin: 0;
		}
		canvas{
			display: block;
			background: #ccc;
			margin: 50px auto;
		}
	</style>
</head>
<body>
	<canvas id="canvas" height="500" width="800"></canvas>
	<script type="text/javascript">
	
			var canvas = document.getElementById("canvas");
			var cv = canvas.getContext('2d');
			var pic = document.createElement("img");
			pic.src = "./file/p.png";

			pic.onload = function(){
				//创建自定义填充规则
				var gz = cv.createPattern(pic,"repeat");
				// var gz = cv.createPattern(pic,"repeat-x");
				// var gz = cv.createPattern(pic,"repeat-y");
				// var gz = cv.createPattern(pic,"no-repeat");

				cv.fillStyle = gz;
				cv.fillRect(20,20,800,500);
			}

	</script>
</body>
</html>