试图通过指南使用AngularJS和bootsrap进行下拉，但id不起作用:)这是我的代码： 我不知道，也许它只是我使用的旧教程，但这就是我现在找到的全部内容。
<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
<meta charset="UTF-8">
<title>Angular</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
<link rel="stylesheet" href="css/style.css">
<script src=""></script>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.4/angular.min.js"></script>
<script src="js/app.js"></script>
</head>
<body ng-controller="dropdown">
<div class="dropdown">
<button type="button" class="btn btn-danger">Menu</button>
<button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" ng-model="dd.data.multipleSelect">
<span class="caret"></span>
<span class="sr-only">Toggle Dropdown</span>
</button>
<ul class="dropdown-menu">
<li ng-repeat="a in subjects"><a ng-click="dropboxitemselected(a)">{{a}}</a><li>
</li>
</ul>
</div>
</body>
</html>
var app = angular.module ('app', []);
app.controller('dropdown', function ($scope) {
$scope.subjects = ['Math', 'Physics', 'Chemistry', 'Hindi', 'English'];
$scope.selectedItem;
$scope.dropboxitemselected = function (item) {
$scope.selectedItem = item;
alert($scope.selectedItem);
};
});
引导下拉示例说将所有内容包装在<div class="dropdown">中。如果你不这样做，它是行不通的...
<div class="dropdown">
<button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">Dropdown Example
<span class="caret"></span></button>
<ul class="dropdown-menu">
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">JavaScript</a></li>
</ul>
</div>