For the previous Internet of Things (IoT) devices, their functions and business logic were already fixed before leaving the factory. Developers could only access them through the APIs opened by the devices. If there was a need to change the functions, they had to rely on the manufacturers. Such a development model is extremely inefficient and requires professional technical support.However, with DejaOS and the JavaScript language, the vast majority of developers can easily get started with development without having to have an in-depth understanding of the details at the hardware level. They only need to perform simple programming to define the functions of the devices and create personalized applications. While lowering the development threshold, component development allows for arbitrary combinations, enabling developers to create applications that are unique to themselves.You only need a piece of Internet of Things device embedded with DejaOS, and then connect the device via VSCode installed with the DejaOS development plugin. By simply writing JavaScript code, you can modify and customize the functions of the device.