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<!DOCTYPE html>
<html ng-app="app">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <link rel="stylesheet" href="../css/lib/bootstrap4.css">

    <script type="text/javascript" src='../js/lib/angular.js' ></script>
    <script type="text/javascript" src='js/initAndController.js'></script>
</head>

<body ng-init="foo='bar'">
    <p ng-controller="myCtrl">
        
    </p>

</body>
</html>

var app = angular.module('app', []);
app.controller('myCtrl', ['$scope', function($scope){
    console.log(foo)
    
}])

Mengapakah ia melaporkan ralat yang mengatakan bahawa foo ialah undefined?
Selain itu, kod berikut juga membingungkan saya:

<!DOCTYPE html>
<html ng-app="app">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title></title>
    <link rel="stylesheet" href="../css/lib/bootstrap4.css">

    <script type="text/javascript" src='../js/lib/angular.js' ></script>
    <script type="text/javascript" src='js/directive.js'></script>
</head>

<body ng-controller="myCtrl">

    <my-directive />

    <h1 ng-init="greet='hello world'">
        The greeting is {{greet}}
    </h1>
</body>
</html>

var app = angular.module('app', []);
app.controller('myCtrl', ['$scope', function($scope){
    
    
}])
app.directive('myDirective',function(){
    return {
        restrict : 'E',
        replace : true,
        template : '<a >to Google</a>'
    }
})

Mengapa hanya terdapat satu hasil ke Google tetapi tiada teks dalam teg h1?