In a method for developing a child application, an interface of a child application developer tool is displayed. The child application developer tool is configured to provide a plurality of child application development modes. Each of the child application development modes is associated with a different run-time environment. A user selection of one of the plurality of child application development modes is received via the interface. Based on the selected one of the plurality of child application development modes, development mode information of a parent application that is associated with the one of the plurality of child application development modes is obtained. The run-time environment of the parent application is created based on the obtained application development mode information. At least one of code editing or code debugging of the child application is performed via the child application developer tool.