Text rendering
In the component file, you can add a script tag to write the logic code of the component. You can set component parameters through the exposed default object.
data parameter is used to define the default data for component elements. Once the instantiation is complete, you can use template syntax.
Text rendering is wrapped in double braces, that is {{xxx}}, where xxx represents the component's property name.
This case demonstrates how to render the val property of component elements.