the demo

assets/Scripts/camera/camerafollow.ts

@@ -0,0 +1,32 @@
+import { Camera, Component, Node, Vec3, _decorator } from 'cc';
+const { ccclass, property } = _decorator;
+
+@ccclass('camerafollow')
+export class camerafollow extends Component {
+    offset: Vec3 = new Vec3();
+    camera: Camera;
+
+    @property(Node) folNode: Node = null
+    start() {
+        this.camera = this.node.getComponent(Camera);
+        this.gameStart()
+    }
+
+    gameStart() {
+        Vec3.subtract(this.offset, this.node.position, this.folNode.position);
+    }
+
+    _tmpV3: Vec3 = new Vec3()
+    update(deltaTime: number) {
+        // if (Game.Instance.gameState != GameState.GAME_PLAY || Game.Instance.player == null)
+        //     return;
+        let targetPos = this._tmpV3;
+        targetPos = Vec3.add(targetPos, this.offset, this.folNode.position);
+        Vec3.lerp(targetPos, this.node.position, targetPos, 0.1);
+        this.node.setPosition(targetPos);
+    }
+
+    clear() {
+        this.node.position = new Vec3(0, 0, 0);
+    }
+}

assets/Scripts/camera/camerafollow.ts.meta

@@ -0,0 +1,9 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "ff6d36e8-a512-4150-9bd8-a29280339aa8",
+  "files": [],
+  "subMetas": {},
+  "userData": {}
+}