refactor(v3): generate unique id

packages/uni-app-plus/dist/index.v3.js

@@ -297,10 +297,6 @@ var serviceContext = (function () {
     return ('' + str).replace(/[^\x00-\xff]/g, '**').length
   }
 
-  function guid () {
-    return Math.floor(4294967296 * (1 + Math.random())).toString(16).slice(1)
-  }
-
   function debounce (fn, delay) {
     let timeout;
     return function () {
@@ -12886,7 +12882,11 @@ var serviceContext = (function () {
           this._$vdomSync = new VDomSync(this.$options.pageId, this.$options.pagePath, this);
         }
         if (this._$vd) {
-          this._$id = guid();
+          if (!this.$parent) {
+            this._$id = '-1';
+          } else {
+            this._$id = this.$parent._$id + ',' + this.$vnode.data.attrs._i;
+          }
           this._$vd.addVm(this);
           this._$vdMountedData = Object.create(null);
           this._$setData(MOUNTED_DATA, this._$vdMountedData);

packages/uni-app-plus/dist/service.runtime.esm.js

@@ -5640,8 +5640,7 @@ function insertBefore() {
 }
 
 function removeChild(node, child) {
-  if (child && child._$vd) {
-    // TODO 目前存储的 element 非树形，remove 的不干净(会遗留子节点)
+  if (child && child._$vd) {
     child._$vd.removeElement(child);
   }
 }
@@ -6801,14 +6800,13 @@ function updateDOMListeners (oldVnode, vnode) {
   var on = vnode.data.on || {};
   var oldOn = oldVnode.data.on || {};
   target$1 = vnode.elm;
-
+  
   // fixed by xxxxxx 存储 vd
+  target$1._$vd = vnode.context._$vd;
   var context = vnode.context;
-  target$1._$vd = context._$vd || (context.$root && context.$root._$vd);
-
   // 存储事件标记
   target$1.setAttribute('nid', String(vnode.data.attrs['_i']));
-  target$1.setAttribute('cid', context._$id || vnode.data.cid);
+  target$1.setAttribute('cid', context._$id);
 
   normalizeEvents(on);
   updateListeners(on, oldOn, add$1, remove$2, createOnceHandler$1, vnode.context);

src/platforms/app-plus/service/framework/plugins/data.js

 import {
-  guid,
   hasOwn,
   isObject,
   camelize
@@ -88,7 +87,11 @@ export function initData (Vue) {
         this._$vdomSync = new VDomSync(this.$options.pageId, this.$options.pagePath, this)
       }
       if (this._$vd) {
-        this._$id = guid()
+        if (!this.$parent) {
+          this._$id = '-1'
+        } else {
+          this._$id = this.$parent._$id + ',' + this.$vnode.data.attrs._i
+        }
         this._$vd.addVm(this)
         this._$vdMountedData = Object.create(null)
         this._$setData(MOUNTED_DATA, this._$vdMountedData)

src/platforms/app-plus/view/framework/plugins/vdom-sync.js

-import {
-  guid
-} from 'uni-shared'
-
 import {
   VD_SYNC,
   UI_EVENT
 } from '../../../constants'
 
+function findParentCid (vm) {
+  let parent = vm.$parent
+  while (parent) {
+    if (parent._$id) {
+      return parent._$id
+    }
+    parent = parent.$parent
+  }
+}
+
 export class VDomSync {
   constructor (pageId) {
     this.pageId = pageId
-    this.addBatchVData = []
+    this.addBatchVData = Object.create(null)
     this.updateBatchVData = []
     this.vms = Object.create(null)
   }
 
   addVData (cid, data = {}, options = {}) {
-    this.addBatchVData.push([cid, data, options])
+    this.addBatchVData[cid] = [data, options]
   }
 
   updateVData (cid, data = {}) {
@@ -24,13 +30,22 @@ export class VDomSync {
   }
 
   initVm (vm) {
-    const [cid, data, options] = this.addBatchVData.shift()
-    if (!cid) {
-      vm._$id = guid()
+    if (!vm.$parent) {
+      vm._$id = '-1'
+    } else {
+      vm._$id = findParentCid(vm) + ',' + vm.$vnode.data.attrs._i
+    }
+    let vData = this.addBatchVData[vm._$id]
+    if (!vData) {
       console.error('cid unmatched', vm)
+      vData = {
+        data: {},
+        options: {}
+      }
     } else {
-      vm._$id = cid
+      delete this.addBatchVData[vm._$id]
     }
+    const [data, options] = vData
     Object.assign(vm.$options, options)
     vm.$r = data || Object.create(null)
     this.vms[vm._$id] = vm
@@ -50,7 +65,12 @@ export class VDomSync {
   }
 
   clearAddBatchVData () {
-    this.addBatchVData.length = 0
+    if (process.env.NODE_ENV !== 'production') {
+      if (Object.keys(this.addBatchVData).length) {
+        console.error('this.addBatchVData...=' + JSON.stringify(this.addBatchVData))
+      }
+    }
+    this.addBatchVData = Object.create(null)
   }
 
   flush () {