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<canvas id="myCanvas" width="500" height="200" style="border:2px solid #6699cc"></canvas>
<button type="button" class="btn btn-primary" onclick="javascript:clearArea();return false;">清空画板<tton>
Line width : <select id="selWidth">
<option value="1">1</option>
<option value="3">3</option>
<option value="5">5</option>
<option value="7">7</option>
<option value="9" selected="selected">9</option>
<option value="11">11</option>
<lect>
Color : <select id="selColor">
<option value="black">black</option>
<option value="blue" selected="selected">blue</option>
<option value="red">red</option>
<option value="green">green</option>
<option value="yellow">yellow</option>
<option value="gray">gray</option>
<lect>
