Is it okay to keep the charger plugged in

Charger has been plugged into the socket on the impact:
1, shorten the life of the charger: because the charger is composed of electronic components, has been in the socket will have a micro-current through, a long time will cause the charger to heat up, easy to cause component aging, some will also be short-circuited, will greatly shorten the life of the charger;
2, consumption of electricity: charger has been plugged into the socket, although not charging the phone, but the internal circuit board of the charger is electrified, so the charger has been in the working state, and consume a certain amount of electricity;
3, there are security risks: if the charger is poor quality, their own heat is serious, plus their own living room environment is closed and hot weather conditions, easy to create a spontaneous combustion and spontaneous explosion of the charger's environment, of course, the charger has a protective device, triggered by spontaneous combustion and spontaneous explosion of the chances are very small, but we can not rule out the possibility that the power supply equipment failures or cottage chargers, it is best to unplug the charger, to avoid the occurrence of a security incident!