html - alert window not working with angular -

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I have the following code in which I want to display a warning when clicking a button: 

  & lt ;! DOCTYPE html & gt; & Lt; Html & gt; & Lt; Top & gt; & Lt; Title & gt; & Lt; / Title & gt; & Lt; / Head & gt; & Lt; Body ng-app & gt; & Lt; Button ng-click = "alert ('test')" & gt; Display text & lt; / Button & gt; & Lt; Script src = "angular.min.js" & gt; & Lt; / Script & gt; & Lt; Script type = "text / javascript" & gt; Document.write ("& lt; base href = \" "+ document.location +" \ "/>"); & Lt; / Script & gt; & Lt; Script type = "text / javascript" & gt; $ Scope.alert = function (variable) {warning (variable); }; & Lt; / Script & gt; & Lt; / Body & gt; & Lt; / Html & gt;   
 This console is being displayed as an error:  Uncounted ReferencesArray: $ scope is not defined    
 
 
  & lt ;! DOCTYPE html & gt; & Lt; Html lang = "en" ng-app = "app" & gt; & Lt; Top & gt; & Lt; Title & gt; & Lt; / Title & gt; & Lt; / Head & gt; & Lt; Body ng-controller = "ModelCtrl" & gt; & Lt; Button ng-click = "alert ('test')" & gt; Display text & lt; / Button & gt; & Lt; Script src = "angular.min.js" & gt; & Lt; / Script & gt; & Lt; Script type = "text / javascript" & gt; Document.write ("& lt; base href = \" "+ document.location +" \ "/>"); & Lt; / Script & gt; & Lt; Script type = "text / javascript" & gt; Var app = angular Module ('app', []); App.controller ('ModelCtrl', function ($ radius, $ http) {$ scope.alert = function (variable) {warning (variable);};}); & Lt; / Script & gt; & Lt; / Body & gt; & Lt; / Html & gt;

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