ng-repeat出現環路輸出Duplicates in a repeater are not allowed. Use 'track by' expression to specif

   採用ng-repeat循環發生錯誤時，以下面的輸出對象：

Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: c in shopCount, Duplicate key: undefined:undefined

應該在循環是加下面代碼    ng-repeat item in items track by $index

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