动态创建canvas元素为什么无效？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<!-- <canvas id="myCanvas" width="500" height="500"></canvas> -->
<script type="text/javascript">
var canvas=document.createElement("canvas");
canvas.style.height = '500px';
canvas.style.width = '500px';
//var c=document.getElementById("myCanvas");
//var cxt=c.getContext("2d");
var cxt = canvas.getContext("2d");
cxt.fillStyle="#FF0000";
/*
x 矩形左上角的 x 坐标
y 矩形左上角的 y 坐标
width 矩形的宽度，以像素计
height 矩形的高度，以像素计
*/
cxt.fillRect(0,0,500,500);
</script>
</body>
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JavaScript