For the record, the problem that my local idea cannot download the plug-in
is convenient to reappear next time, and it will be a help to the novice code friends. After all, compared with those in csdn, downloading plug-ins created by individual people or what needs C coins. Or the money is good.
First of all, there may be the following situation that the input search plug-in will only be loaded all the time. Let me introduce how to solve this situation. Solution 
steps:
1. Turn off the firewall
2. Remove Use secure connection in System Settings–>updates Check the box
.In fact, it’s okay not to do this step. The idea version is different. There is no such option in this place.
3. Check the auto-detect proxy setting
and then we will turn off IDEA (note that the process is closed), restart a few times to search.
You can test it yourself, but there is no time for children.