{if condition="$Think.const.PJAX"}
{block name='nav'}{/block}
{block name="main"}{/block} {block name='foot'} {/block} {else} {block name="head"}{/block}
{block name='nav'}{/block}
{block name="main"}{/block}
{block name='modal'}{/block} {block name='foot'} {/block} {/if}