无法使用jQuery添加html标签和关联数据

I have been using jQuery for a short period of time & currently I am working with a website where user will log in and then jQuery will get the data from the server and append it to the existing html code. I have searched a lot in stackoverflow for this and my current code is actually the summary of what I have learnt fro here. I have tried with the load function but later I saw it has been deprecated. I have been using jQuery for a short period of