angularjs使用ng-repeat报错Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed

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

ng-Repeat不允许collection中存在两个相同Id的对象，对于数字或者字符串等基本数据类型来说，它的id就是它自身的值。因此数组中是不允许存在两个相同的数字的。为了规避这个错误，需要定义自己的track by表达式。

　　// 业务上自己生成唯一的id
　　item in items track by item.id

　　//或者直接拿循环的索引变量$index来用
　　item in items track by $index

原代码：<div ng-repeat="edu in educations ">

修改后：<div ng-repeat="edu in educations track by $index">

原代码：

<div ng-init="months = ['八月','八月','八月']" ng-repeat="month in months">

  {{month}}

</div> 

修改后：

<div ng-init="months = ['八月','八月','八月']" ng-repeat="month in months track by $index">

  {{month}}

</div>