我正在try 更新位于ionic.css文件中名为.pane和.view的两个css Select 器的背景 colored颜色 .然而，当我try 这样做时，一切都没有改变.我可以直接转到ionic.css文件来更改它，但我想直接在index.html文件中使用JavaScript更改它.我try 使用querySelectorAll(".view")和querySelectorAll(".pane")，但当我判断NodeList的内容时，它是空的.index.html的代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width">
<title></title>
<link rel="manifest" href="manifest.json">
<!-- un-comment this code to enable service worker
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('service-worker.js')
.then(() => console.log('service worker installed'))
.catch(err => console.log('Error', err));
}
</script>-->
<link href="lib/ionic/css/ionic.css" rel="stylesheet">
<link href="css/style.css" rel="stylesheet">
<!-- IF using Sass (run gulp sass first), then uncomment below and remove the CSS includes above
<link href="css/ionic.app.css" rel="stylesheet">
-->
<!-- ionic/angularjs js -->
<script src="lib/ionic/js/ionic.bundle.js"></script>
<script src="lib/ionic/js/angular/angular-resource.min.js"></script>
<!-- cordova script (this will be a 404 during development) -->
<!--<script src="cordova.js"></script>-->
<!-- your app's js -->
<script src="js/app_courses.js"></script>
<script src="js/controllers_2_courses.js"></script>
<script src="js/services_courses.js"></script>
</head>
<body ng-app="CITC">
<ion-nav-view></ion-nav-view>
<script>
// Get references to the elements
const paneElements = document.querySelectorAll('.pane');
const viewElements = document.querySelectorAll('.view');
// Update the background color for each element
paneElements.forEach((element) => {
element.style.backgroundColor = '#111D12';
});
viewElements.forEach((element) => {
element.style.backgroundColor = '#111D12';
});
</script>
</body>
</html>