<h1>圓餅圖設計</h1>
<input type="text" id="ninput" value="3" /><br />
<input type="button" onclick="createinput()" value="產生輸入框" />

<form id='myform' style="margin-top: 20px;">
<div id='showinput'></div>
<input type="button" value="產生圓餅圖" onclick="showme()"/>
</form>

<canvas id='mycan'></canvas>