docs: add target blank for all links (#5073)

packages/vant-markdown-loader/src/index.js

@@ -3,6 +3,7 @@ const MarkdownIt = require('markdown-it');
 const markdownItAnchor = require('markdown-it-anchor');
 const frontMatter = require('front-matter');
 const highlight = require('./highlight');
+const linkOpen = require('./link-open');
 const cardWrapper = require('./card-wrapper');
 const { slugify } = require('transliteration');
 
@@ -58,6 +59,7 @@ module.exports = function(source) {
 
   options = {
     wrapper,
+    linkOpen: true,
     ...options
   };
 
@@ -68,5 +70,9 @@ module.exports = function(source) {
     source = fm.body;
   }
 
+  if (options.linkOpen) {
+    linkOpen(parser);
+  }
+
   return options.wrapper(parser.render(source), fm);
 };

packages/vant-markdown-loader/src/link-open.js

@@ -0,0 +1,18 @@
+// add target="_blank" to all links
+module.exports = function linkOpen(md) {
+  const defaultRender =
+    md.renderer.rules.link_open ||
+    function(tokens, idx, options, env, self) {
+      return self.renderToken(tokens, idx, options);
+    };
+
+  md.renderer.rules.link_open = function(tokens, idx, options, env, self) {
+    const aIndex = tokens[idx].attrIndex('target');
+
+    if (aIndex < 0) {
+      tokens[idx].attrPush(['target', '_blank']); // add new attribute
+    }
+
+    return defaultRender(tokens, idx, options, env, self);
+  };
+};