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:undefined
应该在循环是加以下代码 ng-repeat item in items track by $index
ng-repeat循环输出出现Duplicates in a repeater are not allowed. Use 'track by' expression to specify unique
原文：http://blog.csdn.net/u013440660/article/details/42077787