从textarea中获取数据，按编辑样式显示内容

转载至：http://blog.youkuaiyun.com/bleibo/article/details/4994203

 步骤：

           1.  用<pre><%=从数据库显示的字段%></pre>   

           2. 显示页面中增加：

               <style type="text/css">
                 pre {
                          white-space: pre-wrap;
                          white-space: -moz-pre-wrap;
                          white-space: -pre-wrap;
                          white-space: -o-pre-wrap;
                          word-wrap: break-word;
                          }
                </style>