flask接受jquery ajax传递过来的参数

I have been working with similar functionality and after a bit of messing around with the ajax and python, this is what I came up with for python reading the ajax data

JavaScript:

var data = {
      data: JSON.stringify({
                        "value":'asdf'
                    })
   }
};

$.ajax({
   url:"/",
   type: 'POST',
   data: data,
   success: function(msg){
              alert(msg);
            }
})

Python:

from flask import json
@app.route("/", methods=['POST'])
def get_data():
    data = json.loads(request.form.get('data'))
    ss = data['value']
    return str(ss)




注意：

javascript 不能如下写法，不知为什么：

$.ajax({
   url:"/",
   type: 'POST',
   data: {"value":"val1"},
   success: function(msg){
              alert(msg);
            }
})

在java和nodejs中可以这么写，但flask不能！