html 

其中 {{url_for('add')}} 的 add 为 flask 路由函数名

dataType: "json", 加了这句，才能读到 flask 返回的 json

var my_tra_info = {"key1":"val1","key2":val2};$.ajax({type:'post',async:false,url:"{{url_for('add')}}",data:my_tra_info,dataType: "json",success:function (result) {alert(result);}});

flask

@app.route('/add', methods=['GET', 'POST'])
def add():key1 = request.form.get("key1")key2= request.form.get("key2")print (key1)print(key2)return json.dumps({key1:key2})