分配给呈现小部件的类由传递给register_sidebar() 用于注册侧栏的调用。e、 g.：
<?php
$args = array(
\'name\' => sprintf(__(\'Sidebar %d\'), $i ),
\'id\' => \'sidebar-$i\',
\'description\' => \'\',
\'before_widget\' => \'<li id="%1$s" class="widget %2$s">\',
\'after_widget\' => \'</li>\',
\'before_title\' => \'<h2 class="widgettitle">\',
\'after_title\' => \'</h2>\' );
?>
请参见
before_widget 参数：
\'before_widget\' => \'<li id="%1$s" class="widget %2$s">\'
。。。相应地更改，例如：
\'before_widget\' => \'<li id="%1$s" class="block %2$s">\'
