freemarker中的substring取子串

1、substring取子串介绍

（1）表达式?substring(from,to)

（2）当to为空时，默认的是字符串的长度

（3）from是第一个字符的开始索引，to最后一个字符之后的位置索引

2、举例说明

     <#--freemarker中的substring取子串-->
     
     ${'EFGHIJKL'?substring(0)}
     ${'EFGHIJKL'?substring(1)}
     ${'EFGHIJKL'?substring(2)}
     ${'EFGHIJKL'?substring(3)}
     ${'EFGHIJKL'?substring(4)}
     ${'EFGHIJKL'?substring(5)}
     ${'EFGHIJKL'?substring(6)}
     ${'EFGHIJKL'?substring(7)}
     ${'EFGHIJKL'?substring(8)}
     
     ${'EFGHIJKL'?substring(0,1)}
     ${'EFGHIJKL'?substring(0,2)}
     ${'EFGHIJKL'?substring(0,3)}
     ${'EFGHIJKL'?substring(0,4)}
     ${'EFGHIJKL'?substring(0,5)}
     ${'EFGHIJKL'?substring(0,6)}
     ${'EFGHIJKL'?substring(0,7)}
     ${'EFGHIJKL'?substring(0,8)}

     EFGHIJKL
     FGHIJKL
     GHIJKL
     HIJKL
     IJKL
     JKL
     KL
     L
     
     
     E
     EF
     EFG
     EFGH
     EFGHI
     EFGHIJ
     EFGHIJK
     EFGHIJKL