demo: update demo

docs/demo/multiple-with-maxCount.md

@@ -0,0 +1,8 @@
+---
+title: multiple-with-maxCount
+nav:
+  title: Demo
+  path: /demo
+---
+
+<code src="../examples/multiple-with-maxCount.tsx"></code>

docs/examples/multiple-with-maxCount.tsx

@@ -0,0 +1,36 @@
+/* eslint-disable no-console */
+import React from 'react';
+import Select from 'rc-select';
+import '../../assets/index.less';
+
+const Test: React.FC = () => {
+  const [value, setValue] = React.useState<string[]>(['1']);
+
+  const onChange = (v: any) => {
+    setValue(v);
+  };
+
+  return (
+    <>
+      <h2>Multiple with maxCount</h2>
+      <Select
+        maxCount={4}
+        mode="multiple"
+        value={value}
+        animation="slide-up"
+        choiceTransitionName="rc-select-selection__choice-zoom"
+        style={{ width: 500 }}
+        optionFilterProp="children"
+        optionLabelProp="children"
+        placeholder="please select"
+        onChange={onChange}
+        options={Array.from({ length: 20 }, (_, i) => ({
+          label: <span>中文{i}</span>,
+          value: i.toString(),
+        }))}
+      />
+    </>
+  );
+};
+
+export default Test;