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dede如何对描述字符description限制字数

在Dedecms中,在列表页调用文章摘要的方法主要有:

1:[field:info /]
2:[field:description /]
3:[field:info function=”cn_substr(@me,字符数)”/]
4:[field:description function=”cn_substr(@me,字符数)”/]

方法一:
第一步
进数据库 找到表 dede_archives 下的字段 description 点更改,字段类型选择blob(有些说是改成TEXT,但我试了一下是不行的)
第二步
在dede目录下article_eidt.php里语名$description = cn_substr($description,250);这里的250不是250个字,而是250字符,所以是不能使用到250个这的,在250后面加多个0就可以了.我试过能行的
第三步
进后台,系统—系统基本参数—其它设置—自动摘要的长度(例如写成:250000)(其实这个地方也可以不该的,DEDE已经默认是0-250,这里在经过一二步的更改之后已经不起作用了,随便什么之都行,“0”除外)
适用即可,不要设置太大,避免增加数据库冗余
—————————
方法二:
archives_add.php 中的:$description = cn_substrR($description,$cfg_auot_description); archives_edit.php 中的: $description = cn_substrR($description,250);
这两个语句是用来定义摘要的,$cfg_auot_description是自动摘要长度的变量,250是长度的最大值
可是为什么一定要给摘要规定一个长度呢?
所以这个方法就是直接将摘要长度去掉,将代码改为:
archives_add.php  $description = $description;
archives_edit.php  $description = $description;


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