全角指一个字符占用两个标准字符位置，半角指一字符占用一个标准的字符位置,比如一些论坛无法发链接可以把链接转成全角就可以发。-Full-width refers to a character occupies two standard character position, half-width refers to a character occupies a standard character position, such as some forums can not be made to l