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我想在JavaScript中獲得選擇字段1到8和9到16的總和。我怎樣才能做到這一點?分別計算兩組選擇字段的總和
//sum
<select name="formselect1" style="position:absolute;left:279px;top:235px;width:103px;z-index:2">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect2" style="position:absolute;left:279px;top:259px;width:103px;z-index:3">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect3" style="position:absolute;left:279px;top:283px;width:103px;z-index:4">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect4" style="position:absolute;left:279px;top:307px;width:103px;z-index:5">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect5" style="position:absolute;left:279px;top:331px;width:103px;z-index:6">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect6" style="position:absolute;left:279px;top:355px;width:103px;z-index:7">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect7" style="position:absolute;left:279px;top:379px;width:103px;z-index:8">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect8" style="position:absolute;left:279px;top:402px;width:103px;z-index:9">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<input type="text" name="sum1" id="sum1" />
<select name="formselect9" style="position:absolute;left:384px;top:234px;width:103px;z-index:10">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect10" style="position:absolute;left:384px;top:258px;width:103px;z-index:11">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect11" style="position:absolute;left:384px;top:282px;width:103px;z-index:12">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect12" style="position:absolute;left:384px;top:306px;width:103px;z-index:13">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect13" style="position:absolute;left:384px;top:330px;width:103px;z-index:14">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect14" style="position:absolute;left:384px;top:354px;width:103px;z-index:15">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect15" style="position:absolute;left:384px;top:378px;width:103px;z-index:16">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<select name="formselect16" style="position:absolute;left:385px;top:402px;width:103px;z-index:17">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
</select>
<input type="text" name="sum2" id="sum2" />
我想每次1〜8選擇字段和我。幫助9至16場的總和編寫Java腳本 –