feat: update virtuallist

antdv-demo

@@ -1 +1 @@
-Subproject commit 83ab203d1ab9861132f6efd1e74015507c0e45f6
+Subproject commit 955716e4e9533bc628c651d6ba6c8d1eb9b21a9d

components/vc-virtual-list/utils/CacheMap.js

@@ -0,0 +1,19 @@
+// Firefox has low performance of map.
+class CacheMap {
+  maps;
+
+  constructor() {
+    this.maps = {};
+    this.maps.prototype = null;
+  }
+
+  set(key, value) {
+    this.maps[key] = value;
+  }
+
+  get(key) {
+    return this.maps[key];
+  }
+}
+
+export default CacheMap;

components/vc-virtual-list/utils/isFirefox.js

@@ -0,0 +1,3 @@
+const isFF = typeof navigator === 'object' && /Firefox/i.test(navigator.userAgent);
+
+export default isFF;