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                # 1、回顧昨天的內容 三張表:sheng(省)、shi(市)、xian(縣); sheng.Pcode = shi.ProvinceCode; shi.Code = xian.CityCode; SQL: 查詢所有的省:select * from sheng; 根據Pcode查詢市:select * from shi where ProvinceCode = 130000(Pcode); 根據Ccode查詢縣:select * from xian where CityCode = 130100(Ccode); # 2、PHP查詢數據 ![](https://img.kancloud.cn/03/06/03063280e157884357ca58055747770f_697x451.png) # 3、頁面加載,獲取所有的省 創建02city.html: ![](https://img.kancloud.cn/a9/62/a96208db00882fdab9ae3bebc4ea0684_776x482.png) 02city.php代碼: 稍作修改: ``` 1、將echo "<pre>";注釋,否則會破壞JSON格式。造成JS無法解析JSON。 2、將$data結果,轉換成JSON,然后返回 3、獲取參數type,然后根據type判斷獲取的內容是什么 ``` ![](https://img.kancloud.cn/97/ba/97ba507617aeab5fd4543faca0e9b6ca_702x564.png) # 4、省切換的時候,獲取市 給sheng綁定事件,執行Ajax請求: ![](https://img.kancloud.cn/70/a2/70a299eec87507bb22dcc93e90a5a932_901x580.png) PHP代碼: ![](https://img.kancloud.cn/12/ec/12ec32211f9e2f6a45824675fe8b37b9_841x615.png) 瀏覽器檢測,沒有問題。下面處理返回的結果: ![](https://img.kancloud.cn/e4/6e/e46ec27cdb602d0f58e4da1a35d6577e_924x626.png) # 5、市切換的時候,獲取縣 HTML代碼: ![](https://img.kancloud.cn/4b/27/4b2749625c1576b43b7f6b01e3d4a4ca_880x554.png) PHP代碼: ![](https://img.kancloud.cn/4c/44/4c44d0dfbdf170e4bdfb63d3e9ff49ed_719x300.png) 一個問題,省切換的時候,不但要重置市,還有重置縣: ![](https://img.kancloud.cn/5c/2a/5c2a6d5f31f1b5ba6e546f73778e2139_1089x441.png)
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