The disabled attribute of the input tag is used, but after submitting the data, it is found that the user name is displayed as empty. Later, I found out that when the input is set to the disabled value, there will be the following restrictions:
1. It cannot receive the focus;
2. It will be skipped when using the tab key;
3. It may not be successful.
The solution is: you can use the readonly=”readonly” attribute instead, and there are some limitations when the input is set to the readonly attribute:
1. It can receive the focus, but cannot be modified;
2. You can use the tab key to navigate;
3. It may be successful.
Because only successful form elements are valid data, that is, they can be submitted.
PS: The text input boxes of disabled and readonly can only be modified by scripting the value attribute