用法：在你的<p>或<span>中加上id="tohis"
示例：
<p id="tohis"></p>
<script src="https://cdn.jsdelivr.net/gh/softosdev/history-today/tohis.js "></script><script src="https://softosdev.github.io/history-today/tohis.js "></script>(不推荐)
<script src="scripts/tohis.js"></script>
完整代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>历史上的今天</title>
</head>
<body>
<p id="tohis"></p>
<script src="https://cdn.jsdelivr.net/gh/softosdev/history-today/tohis.js"></script>
</body>
</html>