hexo-theme-icarus/layout/_partial/post/banner.ejs

<% if (post.link){ %>
	<a href="<%- url_for(post.link) %>" target="_blank" itemprop="url"><img src="<%- post.banner %>" class="article-banner"></a>
<% } else if (post.title){ %>
	<% if (index){ %>
		<a href="<%- url_for(post.path) %>" itemprop="url"><img src="<%- post.banner %>" class="article-banner"></a>
	<% } else { %>
		<img src="<%- post.banner %>" class="article-banner">
	<% } %>
<% } %>