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                            ## Canvas坐標體系
~~~
<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			.canvas{
				border: 1px solid red;
			}
		</style>
	</head>
	<body>
		<canvas id="myCanvas" class="canvas">
			您的瀏覽器不支持canvas
		</canvas>
	</body>
</html>
~~~

> 如果用戶的瀏覽器版本比較低，"您的瀏覽器不支持canvas"會顯示出來
> canvas的默認尺寸是300*150px

~~~
<script type="text/javascript">
    var canvas = document.getElementById("myCanvas");
    var ctx = canvas.getContext("2d");
    ctx.moveTo(0,0);
    ctx.lineTo(100,100);
    ctx.stroke();
</script>
~~~

![canvas坐標體系](https://box.kancloud.cn/a3b1bd0d8b0074f73e67ab99aefdf5cd_562x230.jpg)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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