Merge pull request #393 from Tencent/fix-header-anchor-id

Fix header anchor

Author: jiawei686

src/core/hooks/Header.js

@@ -111,10 +111,10 @@ export default class Header extends ParagraphBase {
       const replaceFootNote = /~fn#([0-9]+)#/g;
       anchorID = this.generateIDNoDup(headerTextRaw.replace(replaceFootNote, ''));
     }
-    anchorID = `safe_${anchorID}`; // transform header id to avoid being sanitized
+    const safeAnchorID = `safe_${anchorID}`; // transform header id to avoid being sanitized
     const sign = this.$engine.md5(`${level}-${processedText.sign}-${anchorID}-${dataLines}`);
     const result = [
-      `<h${level} id="${anchorID}" data-sign="${sign}" data-lines="${dataLines}">`,
+      `<h${level} id="${safeAnchorID}" data-sign="${sign}" data-lines="${dataLines}">`,
       this.$getAnchor(anchorID),
       `${html}`,
       `</h${level}>`,