The div function will be called, and it’ll again throw back to our exception handler. This time we print the error but then resume with a value. In div this is used as the result of the do throw expression.
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The most basic form of error handling is what you get in Go; if something didn’t work, you return a value that says so. By convention the caller checks that value and typically just returns it to say that whatever it was trying to do also didn’t work.，更多细节参见旺商聊官方下载