angular $root 读取变量

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.staticfile.org/angular.js/1.4.6/angular.min.js"></script>
</head>
<body>
​
<div ng-app="myApp">
    <div ng-controller="myCtrl">
        <h1>姓氏为 {{lastname}} 家族成员:</h1>
        <ul>
            <li ng-repeat="x in names">{{x}} {{lastname}}</li>
        </ul>
    </div>
    <div ng-controller="myCtrl_1">
        <div>scope中的值是{{lastname_1}}</div>
        <div>rootscope中的值是{{$root.lastname}}</div>
    </div>
</div>
​
​
</body>
</html>
HTML