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Skipping over macros that make it more succinct to return an error, the next iteration of this pattern is checked exceptions in Java. Any function that can fail is annotated with what is effectively a second return value. The thing that’s different is that there’s nothing at the call site needed to return this value, it will be implicitly passed back up through the call stack (each one dynamically resolved, remember) until we hit a catch block, which is just a bit of code that takes that return value and does something with it, not that different to the Go example above.，详情可参考wps下载
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callback: Called with (old_value, new_value) on each change.