【微信小程序】request请求POST提交数据，记得要加上header

          wx.request({
            url: '*******',
            data: {
              "type":"nearest_village",
              "district": that.data.district,
            },
            header: { "Content-Type": "application/x-www-form-urlencoded" },
            method: 'POST',
            success: function(res) {
            //do somethind
           }    
         })

一定要带上header，否则数据提交为空。