一、通过js修改链接a标签 target

<script type="text/javascript">
  function addaTarget(id) {
    var aTags = document.getElementById(id).getElementsByTagName("a");
    for (i = 0; i < aTags.length; i++) {
      var aTags_item = aTags[i];
      aTags_item.target = "_blank";
    }
  }
  addaTarget("post-content-id");
</script>

二、通过Hugo Markdown Render Hooks

可在超链接添加title标签

[Text](https://www.gohugo.io "Title")

增加下面模板文件 layouts/_default/_markup/render-link.html

<a href="{{ .Destination | safeURL }}"{{ with .Title}} title="{{ . }}"{{ end }}{{ if strings.HasPrefix .Destination "http" }} target="_blank" rel="noopener"{{ end }}>{{ .Text | safeHTML }}</a>