break: immediately terminate the entire cycle, and the cycle continues the subsequent code.
continue: The cycle immediately jump (continue following code is not executed, the determination condition continues to cycle for the next cycle) <i.e., terminate the current cycle is not the entire cycle>.
return: out of the entire cycle, and the end of the run method of this function, the residual code is not executed.
goto: Jump to the function or method to be executed statement.