ng-repeat出现环路输出Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique

   采用ng-repeat循环发生错误时，如下面的输出对象：

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

应该在循环是加下面代码    ng-repeat item in items track by $index

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