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今天学习html5 的canvas,发现fillRect的坐标和大小一直不对,研究了半天,发现canvas的宽度和高度必须内联在canvas标签中才对
fillRect(100,100,100,100) 前2个100是指坐标,后2个100是指宽和高。
今天学习html5 的canvas,发现fillRect的坐标和大小一直不对,研究了半天,发现canvas的宽度和高度必须内联在canvas标签中才对。郁闷了半天。
错误的方式1:
复制代码代码如下: <!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> <style> #mycanvas{ width: 200px; height: 200px; background: yellow; } </style> </head> <body> <canvas id='mycanvas' ></canvas> <script> var c = document.getElementById('mycanvas'); var ctx = c.getContext("2d"); ctx.fillStyle='#f36'; ctx.fillRect(100, 100, 100, 100); </script> </body> </html>
错误的方式2:
复制代码代码如下: <!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <canvas id='mycanvas' style='width:200px;height:200px;background:yellow'></canvas> <script> var c = document.getElementById('mycanvas'); var ctx = c.getContext("2d"); ctx.fillStyle='#f36'; ctx.fillRect(100, 100, 100, 100); </script> </body> </html>
显示结果:
正确的方式:
复制代码代码如下: <!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <canvas id='mycanvas' width='200px' height='200px' style='background:yellow'></canvas> <script> var c = document.getElementById('mycanvas'); var ctx = c.getContext("2d"); ctx.fillStyle='#f36'; ctx.fillRect(100, 100, 100, 100); </script> </body> </html>
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