vue中初始化-Toy模板网

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初始化流程

initGlobalAPI处理流程

主要是挂载一些全局方法

响应数据相关的Vue.set, Vue.delete, Vue.nextTick以及Vue.observable
插件相关的Vue.use
对象合并相关Vue.mixin
类继承相关的Vue.extend
资源相关，如组件，过滤器，自定义指令Vue.component, Vue.filter, Vue.directive
配置相关Vue.config以及Vue.options中的components,filters,directives

定义属性config

给Vue对象添加config属性，其中config是在src/core/config.ts文件中导出的

const configDef: Record<string, any> = {}
configDef.get = () => config
Object.defineProperty(Vue, 'config', configDef)

挂载util

主要是将src/core/util下的一些方法放到Vue的util属性中

import {
  warn,
  extend,
  nextTick,
  mergeOptions,
  defineReactive
} from '../util/index'

 Vue.util = {
    warn,
    extend,
    mergeOptions,
    defineReactive
  }

挂载响应式相关方法

设置Vue.set,Vue.delete,Vue.nextTick以及Vue.observable方法

import { set, del } from '../observer/index'
import {
  nextTick
} from '../util/index'
import { observe } from 'core/observer/index'
  Vue.set = set
  Vue.delete = del
  Vue.nextTick = nextTick

  // 2.6 explicit observable API
  Vue.observable = <T>(obj: T): T => {
    observe(obj)
    return obj
  }

Vue.options创建以及设置

创建options空对象以及components,filters,directives空对象，设置options._base为Vue，同时将内置组件(KeepAlive)赋值给components

  import builtInComponents from '../components/index'
  Vue.options = Object.create(null)
  ASSET_TYPES.forEach(type => {
    Vue.options[type + 's'] = Object.create(null)
  })

  // this is used to identify the "base" constructor to extend all plain-object
  // components with in Weex's multi-instance scenarios.
  Vue.options._base = Vue
  extend(Vue.options.components, builtInComponents)

挂载 Vue.use

Vue.use是来管理插件的。安装后的插件是放在_installedPlugins数组中。如果插件plugin实现了install函数，则调用install来安装插件。
如果插件plugin本身是函数，则直接调用
因为Vue.use的第一个参数是插件，后面参数是其它可选参数，在处理参数时，会调整参数，将除去第一个参数后的参数作为新的参数列表，同时将Vue作为第一个参数插入到这个新的参数列表中

  initUse(Vue)
  //下面代码在src/core/global-api/use.ts文件中
  export function initUse(Vue: GlobalAPI) {
  Vue.use = function (plugin: Function | any) {
    const installedPlugins =
      this._installedPlugins || (this._installedPlugins = [])
    if (installedPlugins.indexOf(plugin) > -1) {
      return this
    }

    // additional parameters
    const args = toArray(arguments, 1)
    args.unshift(this)
    if (isFunction(plugin.install)) {
      plugin.install.apply(plugin, args)
    } else if (isFunction(plugin)) {
      plugin.apply(null, args)
    }
    installedPlugins.push(plugin)
    return this
  }
}

挂载Vue.mixin

Vue.mixin用于合并options

initMixin(Vue)
//下面代码在src/core/global-api/mixin.ts文件中
export function initMixin(Vue: GlobalAPI) {
  Vue.mixin = function (mixin: Object) {
    this.options = mergeOptions(this.options, mixin)
    return this
  }
}

mergeOptions主要将child.options中的props,inject,directives规范化，同时合并options下的extends和mixins，根据config下的optionMergeStrategies选项合并策略对key作合并处理。
默认的合并策略是在child没有的情况下，才使用parent选项。

const strats = config.optionMergeStrategies
export function mergeOptions(
  parent: Record<string, any>,
  child: Record<string, any>,
  vm?: Component | null
): ComponentOptions {
  if (isFunction(child)) {
    // @ts-expect-error
    child = child.options
  }

  normalizeProps(child, vm)
  normalizeInject(child, vm)
  normalizeDirectives(child)

  // Apply extends and mixins on the child options,
  // but only if it is a raw options object that isn't
  // the result of another mergeOptions call.
  // Only merged options has the _base property.
  if (!child._base) {
    if (child.extends) {
      parent = mergeOptions(parent, child.extends, vm)
    }
    if (child.mixins) {
      for (let i = 0, l = child.mixins.length; i < l; i++) {
        parent = mergeOptions(parent, child.mixins[i], vm)
      }
    }
  }

  const options: ComponentOptions = {} as any
  let key
  for (key in parent) {
    mergeField(key)
  }
  for (key in child) {
    if (!hasOwn(parent, key)) {
      mergeField(key)
    }
  }
  function mergeField(key: any) {
    const strat = strats[key] || defaultStrat
    options[key] = strat(parent[key], child[key], vm, key)
  }
  return options
}
//默认合并策略
const defaultStrat = function (parentVal: any, childVal: any): any {
  return childVal === undefined ? parentVal : childVal
}

挂载Vue.extend

Vue.extend是通过寄生式组合继承来实现继承
首先看extendOptions._Ctor缓存中是否有父类id对应的继承类，有则使用
使用寄生式组合继承创建子类后，合并options，同时设置子类的父类
初始化子类的options下的props和computed属性
将父类的extend,mixin,use.component, filter,directive赋值给子类
如果有设置组件名，在子类的options.components设置自身
将父类的options赋值给子类的superOptions，继承属性extendOptions赋值给子类的extendOptions,子类之前的选项options赋值给sealedOptions
通过父类id将子类放入缓存

  initExtend(Vue)
  //下面代码在src/core/global-api/extend.ts文件中
  Vue.extend = function (extendOptions: any): typeof Component {
    extendOptions = extendOptions || {}
    const Super = this
    const SuperId = Super.cid
    const cachedCtors = extendOptions._Ctor || (extendOptions._Ctor = {})
    if (cachedCtors[SuperId]) {
      return cachedCtors[SuperId]
    }

    const name =
      getComponentName(extendOptions) || getComponentName(Super.options)

    const Sub = function VueComponent(this: any, options: any) {
      this._init(options)
    } as unknown as typeof Component
    Sub.prototype = Object.create(Super.prototype)
    Sub.prototype.constructor = Sub
    Sub.cid = cid++
    Sub.options = mergeOptions(Super.options, extendOptions)
    Sub['super'] = Super

    // For props and computed properties, we define the proxy getters on
    // the Vue instances at extension time, on the extended prototype. This
    // avoids Object.defineProperty calls for each instance created.
    if (Sub.options.props) {
      initProps(Sub)
    }
    if (Sub.options.computed) {
      initComputed(Sub)
    }

    // allow further extension/mixin/plugin usage
    Sub.extend = Super.extend
    Sub.mixin = Super.mixin
    Sub.use = Super.use

    // create asset registers, so extended classes
    // can have their private assets too.
    ASSET_TYPES.forEach(function (type) {
      Sub[type] = Super[type]
    })
    // enable recursive self-lookup
    if (name) {
      Sub.options.components[name] = Sub
    }

    // keep a reference to the super options at extension time.
    // later at instantiation we can check if Super's options have
    // been updated.
    Sub.superOptions = Super.options
    Sub.extendOptions = extendOptions
    Sub.sealedOptions = extend({}, Sub.options)

    // cache constructor
    cachedCtors[SuperId] = Sub
    return Sub
  }
}

挂载Vue.component,Vue.filter,Vue.directive

主要是自定义组件，过滤器以及指令
如果只是传参id，不传definition，则是直接读取options下的components,filters,directives下id所对应的自定义实现
对于组件类型，并且definition是纯对象时，如果definition有属性name，则使用definition的属性name,否则用id作为definition的name,然后调用Vue.extend来继承definition
对于指令类型，并且definition是函数时，则将bind和update赋值为definition，并且以此作为对象赋值给definition
最后将id与definition的对应关系添加到options.components或者filters或者directives中

  initAssetRegisters(Vue)
  //下面代码在src/core/global-api/assets.ts文件中
export function initAssetRegisters(Vue: GlobalAPI) {
  /**
   * Create asset registration methods.
   */
  ASSET_TYPES.forEach(type => {
    // @ts-expect-error function is not exact same type
    Vue[type] = function (
      id: string,
      definition?: Function | Object
    ): Function | Object | void {
      if (!definition) {
        return this.options[type + 's'][id]
      } else {
        /* istanbul ignore if */
        if (__DEV__ && type === 'component') {
          validateComponentName(id)
        }
        if (type === 'component' && isPlainObject(definition)) {
          // @ts-expect-error
          definition.name = definition.name || id
          definition = this.options._base.extend(definition)
        }
        if (type === 'directive' && isFunction(definition)) {
          definition = { bind: definition, update: definition }
        }
        this.options[type + 's'][id] = definition
        return definition
      }
    }
  })
}

构造函数

Vue构造函数定义在src/core/instance/index.ts文件中，构造函数中会调用原型方法init

function Vue(options) {
  this._init(options)
}

initMixin

定义原型_init方法，在src/core/instance/init.ts文件中

export function initMixin(Vue: typeof Component) {
	Vue.prototype._init = function (options?: Record<string, any>) {
		....
	}
}

设置基础属性

设置_uid

每个vue实例都有一个_uid来作唯一标识，其值从0开始累加

let uid = 0
vm._uid = uid++

设置_isVue

用于标识实体是vue

vm._isVue = true

设置__v_skip

在作响应式处理时，忽略vue实例

vm.__v_skip = true

设置_scope

设置副作用域，兼容vue3

vm._scope = new EffectScope(true /* detached */)
vm._scope._vm = true

设置 $options

合并创建vue. $options 如果optoins包含_isComponent,则调用initInternalComponent指定组件$ options原型，同时将options中的_parentVnode和parent赋值给$options,以及依赖父节点组件选项中的propsData，listeners，children和tag分别赋给 $options的propsData，_parentListeners，_renderChildren和_componentTag，如果options下包含render，把render和staticRenderFns赋值给$options的render和staticRenderFns
否则就解析父类的选项，看是否有修改，如果有修改，则以修改后的选项再作一次合并

   if (options && options._isComponent) {
      // optimize internal component instantiation
      // since dynamic options merging is pretty slow, and none of the
      // internal component options needs special treatment.
      initInternalComponent(vm, options as any)
    } else {
      vm.$options = mergeOptions(
        resolveConstructorOptions(vm.constructor as any),
        options || {},
        vm
      )
    }

export function initInternalComponent(
  vm: Component,
  options: InternalComponentOptions
) {
  const opts = (vm.$options = Object.create((vm.constructor as any).options))
  // doing this because it's faster than dynamic enumeration.
  const parentVnode = options._parentVnode
  opts.parent = options.parent
  opts._parentVnode = parentVnode

  const vnodeComponentOptions = parentVnode.componentOptions!
  opts.propsData = vnodeComponentOptions.propsData
  opts._parentListeners = vnodeComponentOptions.listeners
  opts._renderChildren = vnodeComponentOptions.children
  opts._componentTag = vnodeComponentOptions.tag

  if (options.render) {
    opts.render = options.render
    opts.staticRenderFns = options.staticRenderFns
  }
}

export function resolveConstructorOptions(Ctor: typeof Component) {
  let options = Ctor.options
  if (Ctor.super) {
    const superOptions = resolveConstructorOptions(Ctor.super)
    const cachedSuperOptions = Ctor.superOptions
    if (superOptions !== cachedSuperOptions) {
      // super option changed,
      // need to resolve new options.
      Ctor.superOptions = superOptions
      // check if there are any late-modified/attached options (#4976)
      const modifiedOptions = resolveModifiedOptions(Ctor)
      // update base extend options
      if (modifiedOptions) {
        extend(Ctor.extendOptions, modifiedOptions)
      }
      options = Ctor.options = mergeOptions(superOptions, Ctor.extendOptions)
      if (options.name) {
        options.components[options.name] = Ctor
      }
    }
  }
  return options
}

设置_self

对外暴露自己

 vm._self = vm

初始化生命周期相关的属性

设置属性有$parent，$root，$children，$refs， _provided ，_watcher，_inactive，_direcInactive，_isMounted，_isDestroyed和_isBeingDestroyed
同时会查找当前vue实例的第一个非抽象父类，将其放入其$children中

export function initLifecycle(vm: Component) {
  const options = vm.$options

  // locate first non-abstract parent
  let parent = options.parent
  if (parent && !options.abstract) {
    while (parent.$options.abstract && parent.$parent) {
      parent = parent.$parent
    }
    parent.$children.push(vm)
  }

  vm.$parent = parent
  vm.$root = parent ? parent.$root : vm

  vm.$children = []
  vm.$refs = {}

  vm._provided = parent ? parent._provided : Object.create(null)
  vm._watcher = null
  vm._inactive = null
  vm._directInactive = false
  vm._isMounted = false
  vm._isDestroyed = false
  vm._isBeingDestroyed = false
}

初始化事件相关

设置实例中的_events，_hasHookEvent以及$options._parentListeners

export function initEvents(vm: Component) {
  vm._events = Object.create(null)
  vm._hasHookEvent = false
  // init parent attached events
  const listeners = vm.$options._parentListeners
  if (listeners) {
    updateComponentListeners(vm, listeners)
  }
}

updateComponentListeners在更新组件的事件监听器时，会根据遍历新的事件监听器属性，比较前后两次事件监听器对应属性的值情况，如果老的属性没有定义，而新的有定义，但是子属性fns没有定义，则创建，并且调用add添加到$on回调中，如果新的和旧的监听器对应的属性不相等，则使用新的监听器中的属性，同时对于旧事件监听器中不存在于新事件监听器的则删除

export function updateComponentListeners(
  vm: Component,
  listeners: Object,
  oldListeners?: Object | null
) {
  target = vm
  updateListeners(
    listeners,
    oldListeners || {},
    add,
    remove,
    createOnceHandler,
    vm
  )
  target = undefined
}

export function updateListeners(
  on: Object,
  oldOn: Object,
  add: Function,
  remove: Function,
  createOnceHandler: Function,
  vm: Component
) {
  let name, cur, old, event
  for (name in on) {
    cur = on[name]
    old = oldOn[name]
    event = normalizeEvent(name)
    if (isUndef(cur)) {
      __DEV__ &&
        warn(
          `Invalid handler for event "${event.name}": got ` + String(cur),
          vm
        )
    } else if (isUndef(old)) {
      if (isUndef(cur.fns)) {
        cur = on[name] = createFnInvoker(cur, vm)
      }
      if (isTrue(event.once)) {
        cur = on[name] = createOnceHandler(event.name, cur, event.capture)
      }
      add(event.name, cur, event.capture, event.passive, event.params)
    } else if (cur !== old) {
      old.fns = cur
      on[name] = old
    }
  }
  for (name in oldOn) {
    if (isUndef(on[name])) {
      event = normalizeEvent(name)
      remove(event.name, oldOn[name], event.capture)
    }
  }
}

function add(event, fn) {
  target.$on(event, fn)
}

function remove(event, fn) {
  target.$off(event, fn)
}

function createOnceHandler(event, fn) {
  const _target = target
  return function onceHandler() {
    const res = fn.apply(null, arguments)
    if (res !== null) {
      _target.$off(event, onceHandler)
    }
  }
}

初始化渲染相关

设置_vnode, _staticTrees, $vnode, $slots, $scopedSlots,_c, $createElement
将$attrs和$listeners设置为响应式的

export function initRender(vm: Component) {
  vm._vnode = null // the root of the child tree
  vm._staticTrees = null // v-once cached trees
  const options = vm.$options
  const parentVnode = (vm.$vnode = options._parentVnode!) // the placeholder node in parent tree
  const renderContext = parentVnode && (parentVnode.context as Component)
  vm.$slots = resolveSlots(options._renderChildren, renderContext)
  vm.$scopedSlots = parentVnode
    ? normalizeScopedSlots(
        vm.$parent!,
        parentVnode.data!.scopedSlots,
        vm.$slots
      )
    : emptyObject
  // bind the createElement fn to this instance
  // so that we get proper render context inside it.
  // args order: tag, data, children, normalizationType, alwaysNormalize
  // internal version is used by render functions compiled from templates
  // @ts-expect-error
  vm._c = (a, b, c, d) => createElement(vm, a, b, c, d, false)
  // normalization is always applied for the public version, used in
  // user-written render functions.
  // @ts-expect-error
  vm.$createElement = (a, b, c, d) => createElement(vm, a, b, c, d, true)

  // $attrs & $listeners are exposed for easier HOC creation.
  // they need to be reactive so that HOCs using them are always updated
  const parentData = parentVnode && parentVnode.data

  /* istanbul ignore else */
	defineReactive(
	  vm,
	  '$attrs',
	  (parentData && parentData.attrs) || emptyObject,
	  null,
	  true
	)
	defineReactive(
	  vm,
	  '$listeners',
	  options._parentListeners || emptyObject,
	  null,
	  true
	)
}

调用beforeCreate钩子

在调用钩子时，会禁止响应数据收集，是通过将null加入到栈中
实例中如何设置有beforeCreate属性，则调用回调，同时如果有钩子事件，则触发事件
最后就是恢复环境

callHook(vm, 'beforeCreate', undefined, false /* setContext */)

export function callHook(
  vm: Component,
  hook: string,
  args?: any[],
  setContext = true
) {
  // #7573 disable dep collection when invoking lifecycle hooks
  pushTarget()
  const prev = currentInstance
  setContext && setCurrentInstance(vm)
  const handlers = vm.$options[hook]
  const info = `${hook} hook`
  if (handlers) {
    for (let i = 0, j = handlers.length; i < j; i++) {
      invokeWithErrorHandling(handlers[i], vm, args || null, vm, info)
    }
  }
  if (vm._hasHookEvent) {
    vm.$emit('hook:' + hook)
  }
  setContext && setCurrentInstance(prev)
  popTarget()
}

初始化injection

解析$options中的inject,，遍历inject对象中的属性，不处理__ob__,在属性对应的值为对象时，包含from和default默认值，在有from属性时，从_provied获取对应的值作为属性对应的值，否则如果default对应的值是函数，则将函数调用后的值作为属性对应的值同，否则将default对应的值作为属性对应的值。
遍历result，将vue实例对应的key设置为响应式的

export function initInjections(vm: Component) {
  const result = resolveInject(vm.$options.inject, vm)
  if (result) {
    toggleObserving(false)
    Object.keys(result).forEach(key => {
      /* istanbul ignore else */
        defineReactive(vm, key, result[key])
    })
    toggleObserving(true)
  }
}

export function resolveInject(
  inject: any,
  vm: Component
): Record<string, any> | undefined | null {
  if (inject) {
    // inject is :any because flow is not smart enough to figure out cached
    const result = Object.create(null)
    const keys = hasSymbol ? Reflect.ownKeys(inject) : Object.keys(inject)

    for (let i = 0; i < keys.length; i++) {
      const key = keys[i]
      // #6574 in case the inject object is observed...
      if (key === '__ob__') continue
      const provideKey = inject[key].from
      if (provideKey in vm._provided) {
        result[key] = vm._provided[provideKey]
      } else if ('default' in inject[key]) {
        const provideDefault = inject[key].default
        result[key] = isFunction(provideDefault)
          ? provideDefault.call(vm)
          : provideDefault
      } else if (__DEV__) {
        warn(`Injection "${key as string}" not found`, vm)
      }
    }
    return result
  }
}

初始化state

初始化props

 if (opts.props) initProps(vm, opts.props)
 function initProps(vm: Component, propsOptions: Object) {
  const propsData = vm.$options.propsData || {}
  const props = (vm._props = shallowReactive({}))
  // cache prop keys so that future props updates can iterate using Array
  // instead of dynamic object key enumeration.
  const keys: string[] = (vm.$options._propKeys = [])
  const isRoot = !vm.$parent
  // root instance props should be converted
  if (!isRoot) {
    toggleObserving(false)
  }
  for (const key in propsOptions) {
    keys.push(key)
    const value = validateProp(key, propsOptions, propsData, vm)
    /* istanbul ignore else */
    
    defineReactive(props, key, value)
    
    // static props are already proxied on the component's prototype
    // during Vue.extend(). We only need to proxy props defined at
    // instantiation here.
    if (!(key in vm)) {
      proxy(vm, `_props`, key)
    }
  }
  toggleObserving(true)
}

初始化setup

export function initSetup(vm: Component) {
  const options = vm.$options
  const setup = options.setup
  if (setup) {
    const ctx = (vm._setupContext = createSetupContext(vm))

    setCurrentInstance(vm)
    pushTarget()
    const setupResult = invokeWithErrorHandling(
      setup,
      null,
      [vm._props || shallowReactive({}), ctx],
      vm,
      `setup`
    )
    popTarget()
    setCurrentInstance()

    if (isFunction(setupResult)) {
      // render function
      // @ts-ignore
      options.render = setupResult
    } else if (isObject(setupResult)) {
      // bindings
      vm._setupState = setupResult
      // __sfc indicates compiled bindings from <script setup>
      if (!setupResult.__sfc) {
        for (const key in setupResult) {
          if (!isReserved(key)) {
            proxyWithRefUnwrap(vm, setupResult, key)
          }
        }
      } else {
        // exposed for compiled render fn
        const proxy = (vm._setupProxy = {})
        for (const key in setupResult) {
          if (key !== '__sfc') {
            proxyWithRefUnwrap(proxy, setupResult, key)
          }
        }
      }
    }
  }
}

初始化methods

if (opts.methods) initMethods(vm, opts.methods)

function initMethods(vm: Component, methods: Object) {
  for (const key in methods) {
    vm[key] = typeof methods[key] !== 'function' ? noop : bind(methods[key], vm)
  }
}

初始化data

  if (opts.data) {
    initData(vm)
  } else {
    const ob = observe((vm._data = {}))
    ob && ob.vmCount++
  }
function initData(vm: Component) {
  let data: any = vm.$options.data
  data = vm._data = isFunction(data) ? getData(data, vm) : data || {}
  if (!isPlainObject(data)) {
    data = {}
  }
  // proxy data on instance
  const keys = Object.keys(data)
  const props = vm.$options.props
  const methods = vm.$options.methods
  let i = keys.length
  while (i--) {
    const key = keys[i]
    if (props && hasOwn(props, key)) {
   
    } else if (!isReserved(key)) {
      proxy(vm, `_data`, key)
    }
  }
  // observe data
  const ob = observe(data)
  ob && ob.vmCount++
}

export function getData(data: Function, vm: Component): any {
  // #7573 disable dep collection when invoking data getters
  pushTarget()
  try {
    return data.call(vm, vm)
  } catch (e: any) {
    handleError(e, vm, `data()`)
    return {}
  } finally {
    popTarget()
  }
}

初始化computed

if (opts.computed) initComputed(vm, opts.computed)

function initComputed(vm: Component, computed: Object) {
  // $flow-disable-line
  const watchers = (vm._computedWatchers = Object.create(null))
  // computed properties are just getters during SSR
  const isSSR = isServerRendering()

  for (const key in computed) {
    const userDef = computed[key]
    const getter = isFunction(userDef) ? userDef : userDef.get

    if (!isSSR) {
      // create internal watcher for the computed property.
      watchers[key] = new Watcher(
        vm,
        getter || noop,
        noop,
        computedWatcherOptions
      )
    }

    // component-defined computed properties are already defined on the
    // component prototype. We only need to define computed properties defined
    // at instantiation here.
    if (!(key in vm)) {
      defineComputed(vm, key, userDef)
    }
  }
}

初始化watcher

  if (opts.watch && opts.watch !== nativeWatch) {
    initWatch(vm, opts.watch)
  }

function initWatch(vm: Component, watch: Object) {
  for (const key in watch) {
    const handler = watch[key]
    if (isArray(handler)) {
      for (let i = 0; i < handler.length; i++) {
        createWatcher(vm, key, handler[i])
      }
    } else {
      createWatcher(vm, key, handler)
    }
  }
}

function createWatcher(
  vm: Component,
  expOrFn: string | (() => any),
  handler: any,
  options?: Object
) {
  if (isPlainObject(handler)) {
    options = handler
    handler = handler.handler
  }
  if (typeof handler === 'string') {
    handler = vm[handler]
  }
  return vm.$watch(expOrFn, handler, options)
}

初始化provide

将$options下的provide添加到vm._provide文章来源地址https://www.toymoban.com/news/detail-421296.html

export function initProvide(vm: Component) {
  const provideOption = vm.$options.provide
  if (provideOption) {
    const provided = isFunction(provideOption)
      ? provideOption.call(vm)
      : provideOption
    if (!isObject(provided)) {
      return
    }
    const source = resolveProvided(vm)
    // IE9 doesn't support Object.getOwnPropertyDescriptors so we have to
    // iterate the keys ourselves.
    const keys = hasSymbol ? Reflect.ownKeys(provided) : Object.keys(provided)
    for (let i = 0; i < keys.length; i++) {
      const key = keys[i]
      Object.defineProperty(
        source,
        key,
        Object.getOwnPropertyDescriptor(provided, key)!
      )
    }
  }
}

调用created钩子

    callHook(vm, 'created')

挂载

    if (vm.$options.el) {
      vm.$mount(vm.$options.el)
    }

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vue中初始化