说明：  no intro
(function sentence by one or more code components, can achieve a particular function. You can use your code more readable, understandable, accelerate programming speed and reducing duplication of code. Similar processes and functions, processes and functions most important difference is that the process did not go to the value and the function can return value. In Delphi 7.0, we have a very good definition of function, broadly categorized into six types : data conversion functions, string and array manipulation functions, documents, disk manipulation functions, memory, pointer manipulation functions, arithmetic function, the date function.)