添加一个介绍常驻节点使用的demo

PersistRootNode/assets/Script/HelloWorld.js

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+cc.Class({
+    extends: cc.Component,
+
+    properties: {
+        label: {
+            default: null,
+            type: cc.Label
+        },
+        // defaults, set visually when attaching this script to the Canvas
+        text: 'Hello, World!'
+    },
+
+    // use this for initialization
+    onLoad: function () {
+        this.label.string = this.text;
+    },
+
+    /**
+     * 
+     */
+    onBtn: function () {
+        cc.director.loadScene('Test');
+    },
+
+    // called every frame
+    update: function (dt) {
+
+    },
+});

PersistRootNode/assets/Script/HelloWorld.js.meta

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+{
+  "ver": "1.0.5",
+  "uuid": "280c3aec-6492-4a9d-9f51-a9b00b570b4a",
+  "isPlugin": false,
+  "loadPluginInWeb": true,
+  "loadPluginInNative": true,
+  "loadPluginInEditor": false,
+  "subMetas": {}
+}

PersistRootNode/assets/Script/PersistRoot.js

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+cc.Class({
+    extends: cc.Component,
+
+    properties: {
+        nodeCocos: cc.Node
+    },
+
+
+    onLoad() {
+        this.setPersistRootNode(this.nodeCocos);
+    },
+
+    /**
+     * 设置为常驻节点
+     * @param {*} node 
+     */
+    setPersistRootNode(node) {
+        cc.game.addPersistRootNode(node)
+    },
+
+    /**
+     * 取消常驻根节点，但是不会马上消失。只是将节点还原为可在场景切换时销毁的节点
+     * @param {*} node 
+     */
+    removePersistRootNode(node) {
+        if (cc.game.isPersistRootNode(node)) {
+            cc.game.removePersistRootNode(node);
+        }
+    },
+
+});

PersistRootNode/assets/Script/PersistRoot.js.meta

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+{
+  "ver": "1.0.5",
+  "uuid": "ebd10890-99b4-4a0e-9616-f15ce918df2a",
+  "isPlugin": false,
+  "loadPluginInWeb": true,
+  "loadPluginInNative": true,
+  "loadPluginInEditor": false,
+  "subMetas": {}
+}