javascript - A piece of text can be seen in the web page, but cannot be found in the source code. How to do this?

Question

RT

There is a backend management page, which displays a mobile phone number. F12 to view the source code, locate this place, and find that there is no such number

Global search, there is no such number

Where did this number come from? If it can be displayed on the page, it must come from the page. I feel that my view of the web has been challenged

Replenish:

• During the page operation, no http request is initiated, so it is impossible to interact with the background

Answer 1

input is a replaced element, just like you won’t see the image itself in the source code. This should be the value set by JS to the input.

In the console, document.getElementById('textfield-1371-inputE1').value

Answer 2

Is there an actual link address to check? It may be JS: document.getElementById("ID").innerHTML=Mobile phone number

Answer 3

It should be the mobile phone number retrieved from the database by the backend based on the login account, and then returned to the frontend as a variable, so you can’t see this string in the code