Beside the different silicon cell design, the most important difference between NAND and NOR Flash is the bus interface. NOR Flash is connected to a address / data bus direct like other memory devices as SRAM etc. NAND Flash uses a multiplexed I/O Interface with some additional control pins. NAND flash is a sequential access device appropriate for mass storage applications, while NOR flash is a random access device appropriate for code storage application.NOR Flash can be used for code storage and code execution. Code stored on NAND Flash can't be executed frome there. It must be loaded into RAM memory and executed from there.
NOR NAND
Interface Bus I/O
Cell Size Large Small
Cell Cost High Low
Read Time &
经daquan提醒，发现听雨对于上传的flash文件的脚本没有处理，用户能够利用上传的flash的脚本功能（比如带有geturl动作的flash）实现自动跳转到某个站点。
到北邮人论坛参考了一下，发现他们有对flash脚本的禁用，于是借鉴北邮人的做法，对听雨的flash附件脚本动作进行了处理，具体做法如下：
改动之前的代码：
<objec ......
很多时候，当你有一个层是需要漂浮在页面之上显示的时候，而你的页面里又存在FLASH，这个时候，漂浮层会被FLASH遮挡住，那么解决办法就是给FLASH设置透明属性。
添加参数<param name="wmode"
value="transparent">
//可很好的被IE浏览器所支持
将 wmode="transparent"
加 ......
