因为不是两个相同的emoji ❤️❤ md下两端加上``` 符号后 展示效果: `❤️❤` > 转 Unicode 为 `\u2764\ufe0f\u2764` 查了下原因: [\ufe0f](https://link.segmentfault.com/?enc=pSPg8SzFcnJo6JGOxplvJw%3D%3D.miApQRTDYBIfeerPMvYs%2BcTKMU3Wi8OYzNThxiMBLChq9OB%2BnbU1bPCWmnv4RsEwxt6wyYjLyuq8bOI8gAJQcZ7%2Fh3RLfU1OWn%2BaCMRw9HcWPcAoyvJj3bE2vynmmP96BNkdUwJ38W6uX6Ka6PKxyQ%3D%3D)