使用mutationObserver似乎不能跟踪DOM中的更改表

I am trying to write a simple chrome extension that changes the values of a table in the DOM.The important thing here is that the webpage is using ajax commands to build and change the contents of this table.(First, there is nothing in the page.Then you click on a link, and with an ajax request(no page reloads) a table will be created and after that by clicking other links, this table will be modified).I am trying to write a simple chrome extension