Javascript firefox4还不支持画布吗?
我尝试了以下代码,但firefox4没有显示任何内容Javascript firefox4还不支持画布吗?,javascript,html,canvas,Javascript,Html,Canvas,我尝试了以下代码,但firefox4没有显示任何内容 <script type="text/javascript"> var canvas = document.getElementById('canvas1'); var context = canvas.getContext('2d'); context.strokeStyle = '#990000'; context.strokeRect(20,30,100,50); alert(context); </script&
<script type="text/javascript">
var canvas = document.getElementById('canvas1');
var context = canvas.getContext('2d');
context.strokeStyle = '#990000';
context.strokeRect(20,30,100,50);
alert(context);
</script>
<canvas id="canvas1" width="200px" height="200px">Your browser does not support canvas </canvas>
var canvas=document.getElementById('canvas1');
var context=canvas.getContext('2d');
context.strokeStyle='#990000';
strokeRect(20,30100,50);
警报(上下文);
您的浏览器不支持画布
此代码位于body标记内。根据此搜索,firefox 4支持画布。根据此搜索,firefox 4支持画布。这对我来说很好:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
</head>
<canvas id="canvas1" width="200px" height="200px">Your browser does not support canvas </canvas>
<script type="text/javascript">
var canvas = document.getElementById('canvas1');
var context = canvas.getContext('2d');
context.strokeStyle = '#990000';
context.strokeRect(20,30,100,50);
alert(context);
</script>
<body>
</body>
</html>
无标题文件
您的浏览器不支持画布
var canvas=document.getElementById('canvas1');
var context=canvas.getContext('2d');
context.strokeStyle='#990000';
strokeRect(20,30100,50);
警报(上下文);
这对我来说很好:
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Untitled Document</title>
</head>
<canvas id="canvas1" width="200px" height="200px">Your browser does not support canvas </canvas>
<script type="text/javascript">
var canvas = document.getElementById('canvas1');
var context = canvas.getContext('2d');
context.strokeStyle = '#990000';
context.strokeRect(20,30,100,50);
alert(context);
</script>
<body>
</body>
</html>
无标题文件
您的浏览器不支持画布
var canvas=document.getElementById('canvas1');
var context=canvas.getContext('2d');
context.strokeStyle='#990000';
strokeRect(20,30100,50);
警报(上下文);
您必须了解浏览器执行文件的顺序。
以下是浏览器读取此代码的方式:
<script type="text/javascript">
var canvas = document.getElementById('canvas1');
var context = canvas.getContext('2d');
context.strokeStyle = '#990000';
context.strokeRect(20,30,100,50);
alert(context);
</script>
<canvas id="canvas1" width="200px" height="200px">Your browser does not support canvas </canvas>
注意:使用Javascript时,无需在HTML5中提及它。您必须了解浏览器执行文件的顺序。 以下是浏览器读取此代码的方式:
<script type="text/javascript">
var canvas = document.getElementById('canvas1');
var context = canvas.getContext('2d');
context.strokeStyle = '#990000';
context.strokeRect(20,30,100,50);
alert(context);
</script>
<canvas id="canvas1" width="200px" height="200px">Your browser does not support canvas </canvas>
注意:使用Javascript时,无需在HTML5中提及