使用$smarty->display()时是没有办法将页面以字符串的形式返回的。
查看smarty源码发现display其实是调用的$smarty->fetch()，发现一个$diaplay参数，true时打印页面,false时返回字符串。直接贴源码（...为省略的逻辑代码）
public function fetch($template = null, $cache_id = null, $compile_id = null, $parent = null, $display = false, ...) { ... // display or fetch if ($display) { ... echo $_output; return; } else { ... return $_output; } }所以使用如下语法可以返回页面内容
$smarty->fetch('xxx')；
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