Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expressio

dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to speci"/>

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

angularjs页面试用ng-repeat时，刷新页面报错

Error: [ngRepeat:dupes] Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: c in msg, Duplicate key: object:63, Duplicate value: 

ng-repeat添加track by $index即可避免

例如：
ng-repeat="val in msg track by $index"