feat(Anchor): add targetOffset prop demo

components/anchor/__tests__/__snapshots__/demo.test.js.snap

@@ -301,3 +301,83 @@ exports[`renders ./components/anchor/demo/static.md correctly 1`] = `
   </div>
 </div>
 `;
+
+exports[`renders ./components/anchor/demo/targetOffset.md correctly 1`] = `
+<div>
+  <div
+    class=""
+  >
+    <div
+      class="ant-anchor-wrapper"
+      style="max-height:100vh"
+    >
+      <div
+        class="ant-anchor"
+      >
+        <div
+          class="ant-anchor-ink"
+        >
+          <span
+            class="ant-anchor-ink-ball"
+          />
+        </div>
+        <div
+          class="ant-anchor-link"
+        >
+          <a
+            class="ant-anchor-link-title"
+            href="#components-anchor-demo-basic"
+            title="Basic demo"
+          >
+            Basic demo
+          </a>
+        </div>
+        <div
+          class="ant-anchor-link"
+        >
+          <a
+            class="ant-anchor-link-title"
+            href="#components-anchor-demo-static"
+            title="Static demo"
+          >
+            Static demo
+          </a>
+        </div>
+        <div
+          class="ant-anchor-link"
+        >
+          <a
+            class="ant-anchor-link-title"
+            href="#API"
+            title="API"
+          >
+            API
+          </a>
+          <div
+            class="ant-anchor-link"
+          >
+            <a
+              class="ant-anchor-link-title"
+              href="#Anchor-Props"
+              title="Anchor Props"
+            >
+              Anchor Props
+            </a>
+          </div>
+          <div
+            class="ant-anchor-link"
+          >
+            <a
+              class="ant-anchor-link-title"
+              href="#Link-Props"
+              title="Link Props"
+            >
+              Link Props
+            </a>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</div>
+`;

components/anchor/demo/targetOffset.md

@@ -0,0 +1,34 @@
+---
+order: 4
+title:
+  zh-CN: 设置锚点滚动偏移量
+  en-US: Set Anchor scroll offset
+---
+
+## zh-CN
+
+锚点目标滚动到屏幕正中间。
+
+## en-US
+
+Anchor target scroll to screen center.
+
+```jsx
+import { Anchor } from 'antd';
+
+const { Link } = Anchor;
+
+const targetOffset = window.innerHeight / 2;
+
+ReactDOM.render(
+  <Anchor targetOffset={targetOffset}>
+    <Link href="#components-anchor-demo-basic" title="Basic demo" />
+    <Link href="#components-anchor-demo-static" title="Static demo" />
+    <Link href="#API" title="API">
+      <Link href="#Anchor-Props" title="Anchor Props" />
+      <Link href="#Link-Props" title="Link Props" />
+    </Link>
+  </Anchor>,
+  mountNode,
+);
+```

components/anchor/index.zh-CN.md

@@ -26,7 +26,7 @@ title: Anchor
 | showInkInFixed | 固定模式是否显示小圆点 | boolean | false |  |
 | onClick | `click` 事件的 handler | Function(e: Event, link: Object) | - | 3.9.0 |
 | getCurrentAnchor | 自定义高亮的锚点 | () => string | - | 3.21.0 |
-| targetOffset | 滚动到目标的偏移量 | number | `offsetTop` |  | 0 | 3.21.0 |
+| targetOffset | 锚点滚动偏移量，默认与 offsetTop 相同，[例子](#components-anchor-demo-targetOffset) | number | `offsetTop` | 3.21.0 |
 
 ### Link Props