Angular ng-Repeat Array of Array Instances

//First define an array

Angular code:

var app = angular.module('serApp', []); 
app.controller('indexCtrl', function($scope, $http) 
{ $scope.arrs = [{
<BR>　　　　　　　　　　　　　　　　　　 n:'a'; 
        arr:['1','2','1']; 
      },{<BR><BR> 　　　　　　　　　　　　　　　　　　 n:'b'; 
        arr:['4','5','6']; 
      }; 
    ) 

html code:

<BR>　　　　
<div ng-controller="indexCtrl"><BR>      
<p>{{name}}</p><BR>      
<ul><BR>        
 <li ng-repeat="name in names">{{name.n}}<BR>          
 <p ng-repeat="a in name.arr track by $index" id="{{$index}}">{{a}}</p><BR>        
 </li><BR>      
</ul>
<BR>    
</div><BR><BR> 

track by $index needs to be added when there are duplicate values, otherwise the browser will report this error: Error: [ngRepeat:dupes] and it will not be rendered on the page

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