pre标记，火狐中不换行的问题

 

pre {white-space: pre-wrap;       /* css-3 */white-space: -moz-pre-wrap;  /* Mozilla, since 1999 */white-space: -pre-wrap;      /* Opera 4-6 */white-space: -o-pre-wrap;    /* Opera 7 */word-wrap: break-word;       /* Internet Explorer 5.5+ */}