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有人可以告诉我为什么我的 Plunker 不喜欢我吗？
http://plnkr.co/edit/Ft1YgUsXCnFxfyr5ob8r
谢谢，
J.P
您的数据存在一些问题。
这应该工作： http ://plnkr.co/edit/buQHJL2QAn6iQcjrKjdX?p=preview