# Code hot reloading
When hot reload is turned on, modify the code file. The emulator can effect the changes without a refresh to improve code editing efficiency and consistency.， This feature recommends using the latest base library versions as much as possible, at least using base libraries greater than 2.12.0 and above.
# Turn on heat loading
You can click on the toolbar above the emulator to set the switch hot overload entrance, you can also set the local settings in the project to turn on and off
Under the development mode of hot overloading, when the wxml / wxss / js file is edited and saved, the hot overloading ability will be automatically triggered, and the modified effect can be seen in real time on the emulator. Improving the efficiency of single page development
# Thermal load execution logic
When heat loading is turned on, the simulator will be updated to varying degrees depending on the situation
- Modify the WXML / WXSS hot overload into the emulator, without refreshing the emulator to take effect changes
- Modify the page JS or the page dependent JS to perform hot overloading
- When you modify JS that is not used by a dependency, a full compilation is triggered
- Modified JSON or apagejs and other files can not be directly hot overload, will trigger a complete compilation
**Note: If you encounter an effect that doesn't match your expectations, you can click the Compile button to recompile
# Related Tutorials
You can visit the video below https://developers.weixin.qq.com/community/business/doc/0004e22a218d98b43fdc690cd5c80d