解决浏览器使用<pre></pre>时不换行

<!-- 解决火狐浏览器中pre标签不换行 -->
<style type="text/css">
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+ */
    } 

</style>