Why use react?

[pengcc]

React helps the developer to implement the UI with Component hierarchies. A component should ideally only do one thing, such a technique is the single responsibility principle.
React allows developers to create large web applications that can change data, without reloading the page. The mission of a component is to render UI. But it's hard to see that the current components are following the basic principle of the react. Why is it necessary to reloading each complete page? And why there is a component Language, which almost totally has nothing to do with the UI, the code can be simply moved to utils as function to be exported.

[zhaofeng-shu33]

docsite is based on React.