AngularJS 1.5.x

var app = angular.module('plunker', []);

app.controller('MainCtrl', function($scope) {
$scope.val=1;
    $scope.func1 = function() {
        alert('func1 is call');
    }
		 $scope.func2 = function() {
        alert('func2 is call');
    }
});

<!DOCTYPE html>
<html ng-app="plunker">

  <head>
    <meta charset="utf-8" />
    <title>AngularJS Plunker</title>
    <script>document.write('<base href="' + document.location + '" />');</script>
    <link rel="stylesheet" href="style.css" />
    <script data-require="angular.js@1.5.x" src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.11/angular.min.js" data-semver="1.5.11"></script>
    <script src="app.js"></script>
  </head>

  <body ng-controller="MainCtrl">
  	<button ng-click="(val == 1)? func2(func1()) : angular.noop()">click</button>
  </body>

</html>

/* Put your css in here */