magento中目录url多层变成单成的方法，app/code/core/Mage/Catalog/Model/Url.php这个php文件，找到
if (null === $parentPath) {
$parentPath = $this->getResource()->getCategoryParentPath($category);
}
elseif ($parentPath == ‘/’) {
$parentPath = ”;
}
把上面的代码修改为：
//if (null === $parentPath) {
//$parentPath = $this->getResource()->getCategoryParentPath($category);
//}
//elseif ($parentPath == ’/') {
$parentPath = ”;
//}