public function __construct($class_name, $method_name, $auto_bind_return = true)
{
$this->class_name = $class_name;
$this->method_name = $method_name;
$this->auto_bind_return = $auto_bind_return;
//默认return输出到body
if ($auto_bind_return) {
$this->params['body'][-1] = array(0 => array(false, null, -1, null));
}
}