ExtJS GridPanel只显示一条记录

问题：在作一个项目时，后台经过json传入前台数据，可是后台打印的是三条数据，前台只显示一条数据。html json格式以下：数据库 {"sqksm":[{"carbonLayerNum":1,"endArea":0,"endTime":"","id":0,"shiHouEndArea":0,"shiHouStartArea":0,"startArea":0,"start Time":"","tr

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