<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
</head>
<body>
<canvas id="can1" width="300px" height="400px" style="border:1px solid red"></canvas>
<script type="text/javascript">
var canvas1=document.retElementById("can1")
var cxt=canvas1.getContext("2d")
cxt.moveTo(20,20);
cxt.lineTo(20,90);
cxt. stroke();
</script>
</body>
</html>直线为什么显示不出来
<html>
<head>
<meta charset="utf-8"/>
</head>
<body>
<canvas id="can1" width="300px" height="400px" style="border:1px solid red"></canvas>
<script type="text/javascript">
var canvas1=document.retElementById("can1")
var cxt=canvas1.getContext("2d")
cxt.moveTo(20,20);
cxt.lineTo(20,90);
cxt. stroke();
</script>
</body>
</html>直线为什么显示不出来
