使用ng-repeat循环输出对象的时候出现如下错误：
Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique keys. Repeater: c in shopCount, Duplicate key: undefined:undefinedDuplicates in
阅读背景：
ng-repeat循环输出出现Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique
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