details和summary标签实现折叠效果

多层折叠：

<details>
          <summary>Season1</summary>
              <details>
                <summary>Episode1</summary>
                <p>剧情简介</p>
              </details>
            <details>
              <summary>Episode2</summary>
              <p>剧情2</p>
            </details>
			
		  <summary>Season2</summary>
              <details>
                <summary>Episode1</summary>
                <p>剧情简介</p>
              </details>
            <details>
              <summary>Episode2</summary>
              <p>剧情2</p>
            </details>
</details>

单层折叠：

<details>
          <summary>目录1</summary>
          <p>内容</p>
</details>