There is a problem with the system today. When entering the page for the first time, click the add icon under the form under normal circumstances, and a sub-item will be added to the page.
When clicking the type at the top to switch the form, click the add icon on the form, and the control for adding subitems is missing, and the input cannot be entered, as shown below:
The error report is as follows:
a preliminary guess may be that there is some wrong type of data. Check the code and find that when you click to switch the type, the form will be blanked
. String, so, to judge the array,
my problem is perfectly solved!