替换为
<!--{if $_G['basescript'] == 'forum' || $_G['basescript'] == 'group'}--><script type="text/javascript" src="https://www.jb51.net/min/g=forum"></script>
<!--{elseif $_G['basescript'] == 'home'}-->
<script type="text/javascript" src="https://www.jb51.net/min/g=home"></script>
<!--{elseif $_G['basescript'] == 'userapp'}-->
<script type="text/javascript" src="https://www.jb51.net/min/g=userapp"></script>
<!--{elseif $_G['basescript'] == 'portal'}-->
<script type="text/javascript" src="https://www.jb51.net/min/g=portal"></script>
<!--{/if}-->
<!--{if $_G['basescript'] != 'portal' && $_GET['diy'] == 'yes' && ($_G[mod] == 'topic' || $_G[group][allowdiy]) && !empty($_G['style']['tplfile'])}-->
<script type="text/javascript" src="https://www.jb51.net/{$_G[setting][jspath]}portal.js?{VERHASH}"></script>
<!--{/if}-->
<!--{if $_GET[diy] == 'yes' && ($_G[mod] == 'topic' || $_G[group][allowdiy]) && !empty($_G['style']['tplfile'])}-->{subtemplate common/css_diy}<!--{/if}-->
打开晋城吧首页，点开源代码 ，看看 开头 的 head 里的 js 是不是少了很多啊
2.修改图片、flash、css、js的缓存时间