我无法设置画布相对于另一个画布的位置,因此我编写了以下测试工具.
我希望在线束顶部的div中"top"和"left"指定的位置会使画布的原点相对于彼此移动.
我究竟做错了什么？
<!DOCTYPE html>
<html>
<head>
<form id='form1' style="position:relative">
<div id='d1' style="position:absolute; top:0; left:0; z-index:1">
<canvas id='canvas1' width='200' height='100'>
Your browser does not support HTML5 Canvas.
</canvas>
</div>
<div id='d2' style="position:absolute; top:50; left:50; z-index:2">
<canvas id='canvas2' width='100' height='200'>
Your browser does not support HTML5 Canvas.
</canvas>
</div>
<div id='d3' style="position:absolute; top:75; left:75; z-index:3">
<canvas id='canvas3' width='50' height='50'>
Your browser does not support HTML5 Canvas.
</canvas>
</div>
</form>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<br>
<input id='btn1' …