Markdown中输出对勾符号和表情包

在行首打对勾

- [ ] Mercury
- [x] Venus
- [x] Earth (Orbit/Moon)
- [x] Mars
- [ ] Jupiter

打对勾符号

- &#9744; x &cross; 
- &#9745; &#10004; &check;

| Unchecked | Unchecked | Checked    | Checked  |
| --------- | :-------: | ---------- | :------: |
| `&#9744;` |  &#9744;  | `&#9745;`  | &#9745;  |
| `x`       |     x     | `&#10004;` | &#10004; |
| `&cross;` |  &cross;  | `&check;`  | &check;  |

☐ x &cross;
☑ ✔ &check;

Unchecked	Unchecked	Checked	Checked
`☐`	☐	`☑`	☑
`x`	x	`✔`	✔
`&cross;`	&cross;	`&check;`	&check;

表情包

语法: &#xCODE;

CODE 可以参考Emoji Unicode Tables

例:

U+1F60D -> 😍 = 😍
U+2705 -> ✅ = ✅
U+2764 -> ❤ = ❤
U+24C2 -> Ⓜ = Ⓜ
U+1F1E8 U+1F1F3 -> 🇨 🇳 / 🇨🇳 = 🇨 🇳 / 🇨🇳
U+231B -> ⌛ = ⌛
U+1F30F -> 🌏 = 🌏
U+1F34E -> 🍎 = 🍎
U+1F34F -> 🍏 = 🍏
U+1F422 -> 🐢 = 🐢
U+1F634 -> 😴 = 😴