React Native does not take effect after modifying the code

install the official documentation: https://facebook.github.io/re., and finally a sample interface appears. After the
code is modified, the document says that double-click the R key to refresh, the simulator is refreshed, but the interface is not updated.

Mar.24,2021

first check whether the modified code is in the correct location, then check whether it is saved, and then check whether an error is reported. If there is no problem, ctrl+M opens the debugging option, and click reload to try

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