JavaScript functions (iii)

A function with a return value

1. Return value: Sometimes we need to return the value of the function to the place where it was called. Implemented by the return statement. Note: When using the return statement, the function stops executing and returns a value.

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Second, local variables and global variables
 1. There are two branches of variables: local variables and global variables
2. What are local variables? What is a global variable?
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JavaScript functions (iii)