我有这个下面的代码所有三个DIV有相同的类名我想要做的是通过使用jquery索引号访问/检索第二个DIV值第二个DIV的值是3.21,我试图使用此代码检索div.OddVal.index(2)没有运气任何想法的人我错了吗？
<div class="ThreeWayCol OddsCol1">
<div class="OddVal ng-pristine ng-untouched ng-valid ng-binding ng-scope ng-not-empty" ng-repeat="sel in event._matchMarket.selections" ng-model="sel" ng-class="{'Sel': oddSelections[event.id].sels[sel.id]}" ng-click="selectOdd(event,event._matchMarket,sel)">3.37</div>
<div class="OddVal ng-pristine ng-untouched ng-valid ng-binding ng-scope ng-not-empty" ng-repeat="sel in event._matchMarket.selections" ng-model="sel" ng-class="{'Sel': oddSelections[event.id].sels[sel.id]}" ng-click="selectOdd(event,event._matchMarket,sel)">3.21</div>
<div class="OddVal ng-pristine ng-untouched ng-valid ng-binding ng-scope ng-not-empty" ng-repeat="sel in event._matchMarket.selections" ng-model="sel" ng-class="{'Sel': oddSelections[event.id].sels[sel.id]}" ng-click="selectOdd(event,event._matchMarket,sel)">2.07</div>
</div>
下面，我有一个简单的表单，它有 4 个复选框作为座位。我想要做的是，当访问者选择带有 IDA2和 的座位复选框时A4，我希望在单击名称为 的段落后立即显示这些 ID 及其总值id="demo"。单击按钮 [立即保留] 后，应将总值分配给名为 的变量$TotalCost。
我怎样才能做到这一点？这是我的代码：
<!DOCTYPE html>
<html>
<body>
<h2>Please choose a seat to book</h2>
<form action="/action_page.php" method="post">
<input type="checkbox" name="vehicle" id="A1" value="$100">$100<br>
<input type="checkbox" name="vehicle" id="A2" value="$65"> $65<br>
<input type="checkbox" name="vehicle" id="A3" value="$55"> $55<br>
<input type="checkbox" name="vehicle" id="A4" value="$50"> $50<br>
<p id="demo">
Selected Seat(s)
<br>
<br>
Total: USD <input type="submit" value="Reserve Now">
</form>
</p>
<script>
document.getElementById("A1").addEventListener("click", displayCheck);
function displayCheck() {
document.getElementById("demo").innerHTML = ;
} …