AngularJS uses ng-repeat to report an error [ngRepeat:dupes]

AngularJS uses ng-repeat to report an error

 [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify uniq

ng-repeat error

   
<div ng-init="words = ['University','University','University']" ng-repeat="word in words"> 
  {{word}} 
</div> 

[ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys

It was found that it was caused by duplication of the same content, the solution

<div ng-init="words = ['University','University','University']" ng-repeat="word in words track by $index"> 
  {{word}} 
</div> 

Add after ng-repeat

track by $index 

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