aligns the string to the right within the string variable. Any remaining characters in the string variable are replaced with spaces. If the string is longer than the string variable, characters exceeding the length of the variable are truncated and only the remaining characters are right-aligned within the string variable.
右对齐字符串变量中的字符串，字符串变量中剩余的字符用空格代替。如果字符串变量的长度小于字符串的长度，则超出变量长度的字符将被截去，而仅右对齐剩下的字符。