需求：加一個下拉框選擇條件改變餅圖內外環 餅圖：百度echarts提供

1.1：下拉框條件：後臺取得ViewBag傳給前臺 MonitorController: public ActionResult BigData(): //下拉框篩選條件 var result = MonitorBLL.GetSoilPlantCountByCode(loginSoil); var r = (object)result.data; ViewBag.soilplant

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