这非常适合

This fits in well with something (self-link) I've been working on.

没有类重写来更改ifconfig的行为，您将无法完全执行所需的操作.这是实现ifconfig功能的代码.

You can't do exactly what you want without a class rewrite to change the behavior of ifconfig. Here's the code that implements the ifconfig feature.

File: app/code/core/Mage/Core/Model/Layout.php
protected function _generateAction($node, $parent)
{
    if (isset($node['ifconfig']) && ($configPath = (string)$node['ifconfig'])) {
        if (!Mage::getStoreConfigFlag($configPath)) {
            return $this;
        }
    }

如果检测到ifconfig的存在并且config值返回true，则不会调用action方法.您可以重写_generateAction并实现自己的条件，但是，保持重写的标准负担落在了您身上.

If the presence of an ifconfig is detected and the config value returns true, the action method will not be called. You could rewrite _generateAction and implement your own conditional, but then the standard burdens of maintaining a rewrite fall you on.

更好的方法是在动作参数中使用辅助方法.像这样

A better approach would be to use a helper method in your action paramater. Something like this

<action method="setTemplate">
    <template helper="mymodule/myhelper/switchTemplateIf"/>
</action>

将调用setTemplate通过调用

will call setTemplate with the results of a call to

Mage::helper('mymodule/myhelper')->switchTemplateIf();

在switchTemplateIf中实施您的自定义逻辑，该逻辑既可以保留模板也可以对其进行更改，您将一路顺风.

Implement your custom logic in switchTemplateIf that either keeps the template or changes it and you'll be good to go.