使用枚舉，表格驅動的方法優化if...else...代碼?粗糙寫法如下，代碼其實還可以優化
class?AdvertisingRoleEnum{

????const?MALE???=?1;
????const?FEMALE?=?0;

????public?static?function?getStrategy($gender){
????????$listExplain[self::MALE]???=?new?\IMooc\MaleUserStrategy();
????????$listExplain[self::FEMALE]?=?new?\IMooc\FemaleUserStrategy();
????????return?$listExplain[$gender];
????}
}

class?Page
{
????protected?$strategy;

????function?index()
????{
????????echo?"AD:";
????????$this->strategy->showAd();
????????echo?"<br/>";

????????echo?"Category:";
????????$this->strategy->showCategory();
????????echo?"<br/>";

????}

????function?setStrategy(\IMooc\UserStrategy?$strategy){
????????$this->strategy?=?$strategy;
????}

}

$page?=?new?Page();
$gender?=?isset($_GET['female'])??0;
$strategy?=?AdvertisingRoleEnum::getStrategy($gender);
//if?(isset($_GET['female'])){
//????$strategy?=?new??\IMooc\FemaleUserStrategy();
//}else{
//????$strategy?=?new?MaleUserStrategy();
//}
$page->setStrategy($strategy);
$page->index();

主要是很方便切換上下文啊，利于控制，不然每次一改，都要從if else里面修改，除非是機器人，最重要的是解耦，代碼可以獨立調配使用。

主要是降低耦合，個人覺得