wx.request({
         url:'',
         header:{
           "Content-Type":'application/json'
         },
         method:"POST",
         data: {'abc':input_data},
         success:function(res){
           that.setData({
             tip: '',
             ip: res.data

           })

傳輸過去後臺為json ,因為後臺用python寫的緣故,flask的request.form.data()等都接收不到,最好的方式是用

data=request.data
data=json.loads(data)['postdata']