如何解决我该怎么做“ const”？我该怎么做“ var”？最终我应该从哪里开始？
“因此，目标是使估算按钮显示基本价格+送货方式+外部成本+包括证明书+原包装*应纳税。此外，如果未选择送货方式，则屏幕上会显示错误消息。”
请帮助
谢谢
下面的代码
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Collectable Calculator</title>
<style>
thead{
font-weight:bold;
}
td{
padding-left:5px;
padding-right:25px;
}
td.estVal{
text-align:right;
}
</style>
<script>
// I REALLY REALLY NEED HELP
</script>
<h1>HB Racers Collectable Quotes</h1>
<table>
<thead>
<tr>
<td>PROD NO</td>
<td>MODEL NAME</td>
<td>BASE PRICE</td>
<td>ESTIMATE</td>
</tr>
</thead>
<tbody>
<tr>
<td>00-MM</td>
<td>The Mean Machine</td>
<td><input id="txtFirst" type="text" size="10" value="24.50" readonly /></td>
<td class="estVal"><span id="spnFirst"></span></td>
</tr>
<tr>
<td>02-CC</td>
<td>The Creepy Coupe</td>
<td><input id="txtSecond" type="text" size="10" value="35.00" readonly /></td>
<td class="estVal"><span id="spnSecond"></span></td>
</tr>
<tr>
<td>01-BM</td>
<td>The Boulder Mobile</td>
<td><input id="txtThird" type="text" size="10" value="19.75" readonly /></td>
<td class="estVal"><span id="spnThird"></span></td>
</tr>
<tr>
<td>03-CAC</td>
<td>The Convert-A-Car</td>
<td><input id="txtFourth" type="text" size="10" value="40.75" readonly /></td>
<td class="estVal"><span id="spnFourth"></span></td>
</tr>
<tr>
<td>09-TT</td>
<td>The Turbo Terrific</td>
<td><input id="txtFifth" type="text" size="10" value="29.50" readonly /></td>
<td class="estVal"><span id="spnFifth"></span></td>
</tr>
</tbody>
</table>
<h2>Options</h2>
<table>
<tbody>
<tr>
<td class="estVal">Shipping Method:</td>
<td>
<select id="cboShip">
<option value="">Select One</option>
<option value="REG">Regular ($5.50)</option>
<option value="EXP">Express ($15.75)</option>
<option value="OVER">Overnight ($29.95)</option>
</select>
<!-- shipping message into the following span -->
<span id="spnShipWarning" style="color:red;"></span>
</td>
</tr>
<tr>
<td class="estVal">Outside Costs:</td>
<td>
<input id="txtOutside" type="text" size="17" value="0" />
<!-- outside costs message into the following span -->
<span id="spnOutsideWarning" style="color:red;"></span>
</td>
</tr>
<tr>
<td class="estVal">Include Certificate:</td>
<td><input id="chkFigure" type="checkbox" /> @ $2.75</td>
</tr>
<tr>
<td class="estVal">Original Package:</td>
<td><input id="chkOgPack" type="checkbox" /> @ $9.95</td>
</tr>
<tr>
<td class="estVal">Taxable:</td>
<td><input id="chkTax" type="checkbox" /> @ 12%</td>
</tr>
<tr>
<td></td>
<td>
<button id="cmdCalc" onclick="">Estimate</button>
</td>
</tr>
</tbody>
</table>
</body>
</html>
我已经弄清了所有HTML，但无法弄清JavaScript，我可以在此使用一些指导，我将不胜感激。
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