假如一个字串为"1234.56"如果要找出符号的位置=find(".","1234.56")如果要将找到的符号替换为空白=replace("1234.56",find(".","1234.56"),1,"")如果要将找到的符号替换为*号=replace("1234.56",find(".","1234.56"),1,"*")
