在头部添加以下内容：

<script>
	MathJax = {
		tex: {
			inlineMath: [['$', '$']],
			displayMath: [['$$', '$$']],
			processEnvironments: true,
			processRefs: true
		},
		options: {
			skipHtmlTags: ['noscript', 'style', 'textarea', 'pre', 'code'],
			ignoreHtmlClass: 'tex2jax_ignore',
			renderActions: {
				find_script_mathtex: [10, function (doc) {
					for (const node of document.querySelectorAll('script[type^="math/tex"]')) {
						const display = !!node.type.match(/; *mode=display/);
						const math = new doc.options.MathItem(node.textContent, doc.inputJax[0], display);
						const text = document.createTextNode('');
						node.parentNode.replaceChild(text, node);
						math.start = { node: text, delim: '', n: 0 };
						math.end = { node: text, delim: '', n: 0 };
						doc.math.push(math);
					}
				}, '']
			}
		},
		svg: {
			fontCache: 'global'
		}
	};
</script>
<script id="MathJax-script" async src="https://cdn.staticfile.org/mathjax/3.0.1/es5/tex-svg.js"></script>