gvim不显示闪烁警报

set novisualbell
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http://bluesea.chinaunix.com/space.php?uid=20263484&do=blog&id=110193

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vim的help中有这么一段：
Use visual bell instead of beeping.  The terminal code to display the
    visual bell is given with 't_vb'.  When no beep or flash is wanted,
    use ":set vb t_vb=".
    Note: When the GUI starts, 't_vb' is reset to its default value.  You
    might want to set it again in your |gvimrc|.
    In the GUI, 't_vb' defaults to "|f", which inverts the display
    for 20 msec.  If you want to use a different time, use "|40f",
    where 40 is the time in msec.
    Does not work on the Amiga, you always get a screen flash.
    Also see 'errorbells'.
所以光是在.vimrc中set novisualbell还不行，gvimrc中还需要添加。