在我的单页应用程序中，特别是在javascript文件中，我收到一个错误，用于重新滚动函数的未捕获引用。我不明白是什么导致了这个问题。我的 js 文件设置方式错误吗？所述的具体错误是，引用错误，未定义重滚。
.HTML：
<body ng-app="app">
<!-- == Main Controller for SPA == -->
<div class="container-fluid bg-dark text-white" style="height:700px" ng-controller="mainCtrl">
<!-- == App Title == -->
<h2 class="display-2 title-container text-center">{{main.title}}</h2>
<div class="row">
<div class="container-fluid word-container text-center">
<!-- == User Phrase Input == -->
<input type="text" ng-model="word" placeholder="Please enter word">
<br>
<br>
</div>
</div>
<div class="row">
<div class="container-fluid anagram-container text-center">
<!-- == Final anagram == -->
Anagram: {{anagram}}
</div>
</div>
<div class="row">
<div class="container-fluid button-container text-center">
<!-- Anagram "Reroll" Button -->
<button type="button" ng-click="reroll(word)" class="btn btn-primary btn-large">Reroll</button>
<!-- Anagram "Clear" Button -->
<button type="button" class="btn btn-primary btn-large" ng-click="word=''">Clear</button>
</div>
</div>
</div>
</body>
Javascript：
var app = angular.module("app", []);
app.controller('mainCtrl', function($scope) {
$scope.main = {};
$scope.main.title = "AnagramJS";
$scope.reroll = function reroll(value) {
// set anagram to randomize
$scope.anagram = value.split('').sort(function() {
return 0.5 - Math.random()
}).join('');
};
$scope.$watch('word', (newVal, oldVal) => {
if (newVal) {
reroll(newVal);
} else {
// empty anagram if word is empty
$scope.anagram = "";
}
});
angular.extend($scope, {
reroll
});
});
reroll(newVal)应该$scope.reroll(newVal);
同时删除
angular.extend($scope, {
reroll
});