fix(zhihu): decode numeric entities in answer detail (#1629)

Co-authored-by: lihaidong <lihaidong@kingsoft.com>

Author: lenovobenben

clis/zhihu/answer-detail.js

@@ -19,6 +19,18 @@ function stripHtml(html) {
         .replace(/&/g, '&')
         .replace(/"/g, '"')
         .replace(/'/g, "'")
+        .replace(/&#(\d+);/g, (_, value) => {
+            const codePoint = Number(value);
+            return Number.isInteger(codePoint) && codePoint >= 0 && codePoint <= 0x10FFFF
+                ? String.fromCodePoint(codePoint)
+                : _;
+        })
+        .replace(/&#x([0-9a-f]+);/gi, (_, value) => {
+            const codePoint = Number.parseInt(value, 16);
+            return Number.isInteger(codePoint) && codePoint >= 0 && codePoint <= 0x10FFFF
+                ? String.fromCodePoint(codePoint)
+                : _;
+        })
         .replace(/\n{3,}/g, '\n\n')
         .trim();
 }

clis/zhihu/answer-detail.test.js

@@ -304,6 +304,14 @@ describe('zhihu answer-detail helpers', () => {
         expect(out).toBe('hi there & you\n\nsecond');
     });
 
+    it('stripHtml decodes numeric entities', () => {
+        expect(helpers.stripHtml('"中文" & 'test'')).toBe('"中文" & \'test\'');
+    });
+
+    it('stripHtml keeps invalid numeric entities unchanged', () => {
+        expect(helpers.stripHtml('bad � entity')).toBe('bad � entity');
+    });
+
     it('stripHtml maps <br> to single newline', () => {
         expect(helpers.stripHtml('a<br>b<br/>c')).toBe('a\nb\nc');
     });