public function getDescription()
{
if ($this->_description === null) {
$count = 0;
$text = '包括';
foreach ($this->goods as $key => $goods) {
if ($key !== 0) {
$text .= ',';
}
$count += $goods->count;
$text .= "{$goods->count}{$goods->unit}{$goods->name}";
}
$this->_description = "该订单共{$count}件商品,{$text}";
}
return $this->_description;
}