Can the light switch be changed to light switch+socket?

No, because there is generally no zero line in the switch box (the zero line symbol is N and the line color is blue), only red line and white line (red is the fire line and white is the control line). Unless there is a neutral wire in the switch box, connect the live wire and neutral wire to L (live wire, the three colors of live wire represent three-phase live wire) and N (zero wire) of the socket. Note: The above symbols are common and the line color is normal.

There are two solutions: 1, remove the lamp, lead two wires out of the lamp and connect them to the socket. (It can be connected in parallel with the lamp. In theory, there are many examples of lamp holders with sockets, because there is a zero line in the lamp box. (If the superior switch is turned on and the zero line is used together with the dew preventer, it may trip, so it will not be used. ) Disadvantages: Turn off the socket.

2. Look in the light box to see if there is a crossing fire line. If there is, connect the crossing fire line and zero line in the light box to L and N of the socket respectively to use.

Safety tip: the above operation needs power off, and it is best to have a guardian, otherwise there will be personal danger.