Golang of learning: abnormal mechanism

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Func Main () {///defer must be thrown before//following an exception if there is an exception (or human panic)//Then stop execution, jump to defer after the code block to finish the work//even if the exception is not thrown, and finally will execute defer after the code to finish// Handling exception information with recover, when err is empty, proves that there is no exception thrown//If not NULL, exception handling defer func () {if err: = Recover (); nil!=err {fmt. PRINTLN (Err)}fmt. Println ("can show..")} () f ()}func F () {fmt. Println ("Heihei") Panic ("oh! Error ")//Throw an exception by hand, regardless of whether the exception is thrown, the above defer will be executed at the end of the FMT. Println ("hahah")//Not in execution}