直接引入<head>和<body>标签即可
<head>
<link
rel="stylesheet"
href="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.css"
integrity=
"sha384-zB1R0rpPzHqg7Kpt0Aljp8JPLqbXI3bhnPWROx27a9N0Ll6ZP/+DiW/UqRcLbRjq"
crossorigin="anonymous"
>
<!-- The loading of KaTeX is deferred to speed up page rendering -->
<script
defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/katex.min.js"
integrity=
"sha384-y23I5Q6l+B6vatafAwxRu/0oK/79VlbSz7Q9aiSZUvyWYIYsd+qj+o24G5ZU2zJz"
crossorigin="anonymous"
></script>
<!--
To automatically render math in text elements, include the auto-render extension:
-->
<script
defer src="https://cdn.jsdelivr.net/npm/katex@0.11.1/dist/contrib/auto-render.min.js"
integrity=
"sha384-kWPLUVMOks5AQFrykwIup5lo0m3iMkkHrD0uJ4H5cjeGihAutqP0yW0J6dpFiVkI"
crossorigin="anonymous"
onload="renderMathInElement(document.body);"
></script>
</head>
<body>
\(\frac{x^2}{a^2} + \frac{y^2}{b^2} = 1\)，方程１
<br>这里之前加了1个br标签
<br>这里之前加了1个br标签
<br>爱因斯坦质能方程: \(E =mc^2\) ，方程是否在行中？
</body>
