if标签在HTML中用不了，根本没进行判断
tp 里的使用方法为
可以查看自己的模板引擎使用的是什么？
如果你使用的是Smarty引擎，那么if volist 等tp 内置的一些标签是不能用的。
解决办法：
1；把模板引擎修改为默认的tp 引擎；
2：使用Smarty 内置的一些标签，{if} 等使用方法，可以参考Smarty使用手册，解决。smarty内建函数if、elseif与else的使用方法，分享给大家供大家参考。
<html>
<h2>smarty内建函数if、elseif和else的使用</h2>
<p style="color:red">实例1——>if的使用：取出键名不等于c3和n3之外的键值</p>
{foreach from=$arr4 item=temp}
{foreach from=$temp item=value key=k}
{if $k neq "c3" and $k neq "n3"}
{$k}={$value}
{/if}
{/foreach}<br />
{/foreach}
<p style="color:red">实例2——>elseif的使用：如果是美女，输出一句，否则输出另外一句</p>
{foreach from=$arr4 item=temp}
{foreach from=$temp item=value key=k}
{if $value eq "美女"}
你是个美女
{else}
你们都是帅哥
{/if}
{/foreach}
{/foreach}
</html>
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