说明：   最简单的方法判断一个字符串中是否有汉字 VBA中默认英文字符串都是Unicode，双字节，如果转化为vbFromUnicode就变成单字节， 汉字还是双字节，如果转换之前的字符长度与转化之后的字节长度相等（LenB是计算字符的字节长度的函数）， 说明不含中文字符，反之含有中文字符。
(The simplest way to judge whether a string of Chinese characters have VBA in the default English strings are Unicode, double byte, if it becomes vbFromUnicode into single-byte, or double-byte characters, if characters in length prior to conversion and transformation byte after the same length (LenB is calculated byte characters in length function), indicating that non-Chinese characters, on the contrary contain Chinese characters.)