var myMixin = {
  created: function () {
    this.hello()
  },
  methods: {
    hello: function () {
      console.log('hello from mixin!')
    }
  }
}

Vue.component('componentA',{
  mixins: [myMixin]
})

Vue.mixin({
  created: function () {
      console.log("全局混入")
    }
})

const Modal = {
  template: '#modal',
  data() {
    return {
      isShowing: false
    }
  },
  methods: {
    toggleShow() {
      this.isShowing = !this.isShowing;
    }
  }
}

const Tooltip = {
  template: '#tooltip',
  data() {
    return {
      isShowing: false
    }
  },
  methods: {
    toggleShow() {
      this.isShowing = !this.isShowing;
    }
  }
}

const toggle = {
  data() {
    return {
      isShowing: false
    }
  },
  methods: {
    toggleShow() {
      this.isShowing = !this.isShowing;
    }
  }
}

const Modal = {
  template: '#modal',
  mixins: [toggle]
};
 
const Tooltip = {
  template: '#tooltip',
  mixins: [toggle]
}

export function initMixin (Vue: GlobalAPI) {
  Vue.mixin = function (mixin: Object) {
    this.options = mergeOptions(this.options, mixin)
    return this
  }
}

export function mergeOptions (
  parent: Object,
  child: Object,
  vm?: Component
): Object {

if (child.mixins) { // 判断有没有mixin 也就是mixin里面挂mixin的情�?有的话递归进行合并
    for (let i = 0, l = child.mixins.length; i < l; i++) {
    parent = mergeOptions(parent, child.mixins[i], vm)
    }
}

  const options = {} 
  let key
  for (key in parent) {
    mergeField(key) // 先遍历parent的key 调对应的strats[XXX]方法进行合并
  }
  for (key in child) {
    if (!hasOwn(parent, key)) { // 如果parent已经处理过某个key 就不处理�?      mergeField(key) // 处理child中的key 也就parent中没有处理过的key
    }
  }
  function mergeField (key) {
    const strat = strats[key] || defaultStrat
    options[key] = strat(parent[key], child[key], vm, key) // 根据不同类型的options调用strats中不同的方法进行合并
  }
  return options
}

strats.props =
strats.methods =
strats.inject =
strats.computed = function (
  parentVal: ?Object,
  childVal: ?Object,
  vm?: Component,
  key: string
): ?Object {
  if (!parentVal) return childVal // 如果parentVal没有值，直接返回childVal
  const ret = Object.create(null) // 创建一个第三方对象 ret
  extend(ret, parentVal) // extend方法实际是把parentVal的属性复制到ret�?  if (childVal) extend(ret, childVal) // 把childVal的属性复制到ret�?  return ret
}
strats.provide = mergeDataOrFn

strats.data = function(parentVal, childVal, vm) {    
    return mergeDataOrFn(
        parentVal, childVal, vm
    )
};

function mergeDataOrFn(parentVal, childVal, vm) {    
    return function mergedInstanceDataFn() {        
        var childData = childVal.call(vm, vm) // 执行data挂的函数得到对象
        var parentData = parentVal.call(vm, vm)        
        if (childData) {            
            return mergeData(childData, parentData) // �?个对象进行合�?                                
        } else {            
            return parentData // 如果没有childData 直接返回parentData
        }
    }
}

function mergeData(to, from) {    
    if (!from) return to    
    var key, toVal, fromVal;    
    var keys = Object.keys(from);   
    for (var i = 0; i < keys.length; i++) {
        key = keys[i];
        toVal = to[key];
        fromVal = from[key];    
        // 如果不存在这个属性，就重新设�?        if (!to.hasOwnProperty(key)) {
            set(to, key, fromVal);
        }      
        // 存在相同属性，合并对象
        else if (typeof toVal =="object" && typeof fromVal =="object") {
            mergeData(toVal, fromVal);
        }
    }    
    return to
}

function mergeHook (
  parentVal: ?Array<Function>,
  childVal: ?Function | ?Array<Function>
): ?Array<Function> {
  return childVal
    ? parentVal
      ? parentVal.concat(childVal)
      : Array.isArray(childVal)
        ? childVal
        : [childVal]
    : parentVal
}

LIFECYCLE_HOOKS.forEach(hook => {
  strats[hook] = mergeHook
})

// watch
strats.watch = function (
  parentVal,
  childVal,
  vm,
  key
) {
  // work around Firefox's Object.prototype.watch...
  if (parentVal === nativeWatch) { parentVal = undefined; }
  if (childVal === nativeWatch) { childVal = undefined; }
  /* istanbul ignore if */
  if (!childVal) { return Object.create(parentVal || null) }
  {
    assertObjectType(key, childVal, vm);
  }
  if (!parentVal) { return childVal }
  var ret = {};
  extend(ret, parentVal);
  for (var key$1 in childVal) {
    var parent = ret[key$1];
    var child = childVal[key$1];
    if (parent && !Array.isArray(parent)) {
      parent = [parent];
    }
    ret[key$1] = parent
      ? parent.concat(child)
      : Array.isArray(child) ? child : [child];
  }
  return ret
};

strats.components=
strats.directives=

strats.filters = function mergeAssets(
    parentVal, childVal, vm, key
) {    
    var res = Object.create(parentVal || null);    
    if (childVal) { 
        for (var key in childVal) {
            res[key] = childVal[key];
        }   
    } 
    return res
}

<input type="text" v-model.lazy="value">
<p>{{value}}</p>

<input type="text" v-model.trim="value">

<input v-model.number="age" type="number">

<div @click="shout(2)">
  <button @click.stop="shout(1)">ok</button>
</div>
//只输�?

<form v-on:submit.prevent="onSubmit"></form>

<div v-on:click.self="doThat">...</div>

<button @click.once="shout(1)">ok</button>

<div @click.capture="shout(1)">
    obj1
<div @click.capture="shout(2)">
    obj2
<div @click="shout(3)">
    obj3
<div @click="shout(4)">
    obj4
</div>
</div>
</div>
</div>
// 输出结构: 1 2 4 3 

<!-- 滚动事件的默认行�?(即滚动行�? 将会立即触发 -->
<!-- 而不会等�?`onScroll` 完成  -->
<!-- 这其中包�?`event.preventDefault()` 的情�?-->
<div v-on:scroll.passive="onScroll">...</div>

<my-component v-on:click.native="doSomething"></my-component>

<button @click.left="shout(1)">ok</button>
<button @click.right="shout(1)">ok</button>
<button @click.middle="shout(1)">ok</button>

Vue.config.keyCodes.f2 = 113

//父组�?<comp :myMessage.sync="bar"></comp> 
//子组�?this.$emit('update:myMessage',params);

//父亲组件
<comp :myMessage="bar" @update:myMessage="func"></comp>
func(e){
 this.bar = e;
}
//子组件js
func2(){
  this.$emit('update:myMessage',params);
}

<input id="uid" title="title1" value="1" :index.prop="index">

<svg :viewBox="viewBox"></svg>

function Vue (options) {
  if (process.env.NODE_ENV !== 'production' &&
    !(this instanceof Vue)
  ) {
    warn('Vue is a constructor and should be called with the `new` keyword')
  }
  this._init(options)
}

initMixin(Vue);     // 定义 _init
stateMixin(Vue);    // 定义 $set $get $delete $watch �?eventsMixin(Vue);   // 定义事件  $on  $once $off $emit
lifecycleMixin(Vue);// 定义 _update  $forceUpdate  $destroy
renderMixin(Vue);   // 定义 _render 返回虚拟dom

Vue.prototype._init = function (options?: Object) {
    const vm: Component = this
    // a uid
    vm._uid = uid++
    let startTag, endTag
    /* istanbul ignore if */
    if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
      startTag = `vue-perf-start:${vm._uid}`
      endTag = `vue-perf-end:${vm._uid}`
      mark(startTag)
    }

    // a flag to avoid this being observed
    vm._isVue = true
    // merge options
    // 合并属性，判断初始化的是否是组件，这里合并主要�?mixins �?extends 的方�?    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)
    } else { // 合并vue属�?      vm.$options = mergeOptions(
        resolveConstructorOptions(vm.constructor),
        options || {},
        vm
      )
    }
    /* istanbul ignore else */
    if (process.env.NODE_ENV !== 'production') {
      // 初始化proxy拦截�?      initProxy(vm)
    } else {
      vm._renderProxy = vm
    }
    // expose real self
    vm._self = vm
    // 初始化组件生命周期标志位
    initLifecycle(vm)
    // 初始化组件事件侦�?    initEvents(vm)
    // 初始化渲染方�?    initRender(vm)
    callHook(vm, 'beforeCreate')
    // 初始化依赖注入内容，在初始化data、props之前
    initInjections(vm) // resolve injections before data/props
    // 初始化props/data/method/watch/methods
    initState(vm)
    initProvide(vm) // resolve provide after data/props
    callHook(vm, 'created')

    /* istanbul ignore if */
    if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
      vm._name = formatComponentName(vm, false)
      mark(endTag)
      measure(`vue ${vm._name} init`, startTag, endTag)
    }
    // 挂载元素
    if (vm.$options.el) {
      vm.$mount(vm.$options.el)
    }
  }

export function initState (vm: Component) {
  // 初始化组件的watcher列表
  vm._watchers = []
  const opts = vm.$options
  // 初始化props
  if (opts.props) initProps(vm, opts.props)
  // 初始化methods方法
  if (opts.methods) initMethods(vm, opts.methods)
  if (opts.data) {
    // 初始化data  
    initData(vm)
  } else {
    observe(vm._data = {}, true /* asRootData */)
  }
  if (opts.computed) initComputed(vm, opts.computed)
  if (opts.watch && opts.watch !== nativeWatch) {
    initWatch(vm, opts.watch)
  }
}

function initData (vm: Component) {
  let data = vm.$options.data
  // 获取到组件上的data
  data = vm._data = typeof data === 'function'
    ? getData(data, vm)
    : data || {}
  if (!isPlainObject(data)) {
    data = {}
    process.env.NODE_ENV !== 'production' && warn(
      'data functions should return an object:\n' +
      'https://vuejs.org/v2/guide/components.html#data-Must-Be-a-Function',
      vm
    )
  }
  // proxy data on instance
  const keys = Object.keys(data)
  const props = vm.$options.props
  const methods = vm.$options.methods
  let i = keys.length
  while (i--) {
    const key = keys[i]
    if (process.env.NODE_ENV !== 'production') {
      // 属性名不能与方法名重复
      if (methods && hasOwn(methods, key)) {
        warn(
          `Method "${key}" has already been defined as a data property.`,
          vm
        )
      }
    }
    // 属性名不能与state名称重复
    if (props && hasOwn(props, key)) {
      process.env.NODE_ENV !== 'production' && warn(
        `The data property "${key}" is already declared as a prop. ` +
        `Use prop default value instead.`,
        vm
      )
    } else if (!isReserved(key)) { // 验证key值的合法�?      // 将_data中的数据挂载到组件vm�?这样就可以通过this.xxx访问到组件上的数�?      proxy(vm, `_data`, key)
    }
  }
  // observe data
  // 响应式监听data是数据的变化
  observe(data, true /* asRootData */)
}

Vue.prototype.$mount = function (
  el?: string | Element,
  hydrating?: boolean
): Component {
  // 获取或查询元�?  el = el && query(el)

  /* istanbul ignore if */
  // vue 不允许直接挂载到body或页面文档上
  if (el === document.body || el === document.documentElement) {
    process.env.NODE_ENV !== 'production' && warn(
      `Do not mount Vue to <html> or <body> - mount to normal elements instead.`
    )
    return this
  }

  const options = this.$options
  // resolve template/el and convert to render function
  if (!options.render) {
    let template = options.template
    // 存在template模板，解析vue模板文件
    if (template) {
      if (typeof template === 'string') {
        if (template.charAt(0) === '#') {
          template = idToTemplate(template)
          /* istanbul ignore if */
          if (process.env.NODE_ENV !== 'production' && !template) {
            warn(
              `Template element not found or is empty: ${options.template}`,
              this
            )
          }
        }
      } else if (template.nodeType) {
        template = template.innerHTML
      } else {
        if (process.env.NODE_ENV !== 'production') {
          warn('invalid template option:' + template, this)
        }
        return this
      }
    } else if (el) {
      // 通过选择器获取元素内�?      template = getOuterHTML(el)
    }
    if (template) {
      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
        mark('compile')
      }
      /**
       *  1.将temmplate解析ast tree
       *  2.将ast tree转换成render语法字符�?       *  3.生成render方法
       */
      const { render, staticRenderFns } = compileToFunctions(template, {
        outputSourceRange: process.env.NODE_ENV !== 'production',
        shouldDecodeNewlines,
        shouldDecodeNewlinesForHref,
        delimiters: options.delimiters,
        comments: options.comments
      }, this)
      options.render = render
      options.staticRenderFns = staticRenderFns

      /* istanbul ignore if */
      if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
        mark('compile end')
        measure(`vue ${this._name} compile`, 'compile', 'compile end')
      }
    }
  }
  return mount.call(this, el, hydrating)
}

// public mount method
Vue.prototype.$mount = function (
  el?: string | Element,
  hydrating?: boolean
): Component {
  el = el && inBrowser ? query(el) : undefined
  // 渲染组件
  return mountComponent(this, el, hydrating)
}

export function mountComponent (
  vm: Component,
  el: ?Element,
  hydrating?: boolean
): Component {
  vm.$el = el
  // 如果没有获取解析的render函数，则会抛出警�?  // render是解析模板文件生成的
  if (!vm.$options.render) {
    vm.$options.render = createEmptyVNode
    if (process.env.NODE_ENV !== 'production') {
      /* istanbul ignore if */
      if ((vm.$options.template && vm.$options.template.charAt(0) !== '#') ||
        vm.$options.el || el) {
        warn(
          'You are using the runtime-only build of Vue where the template ' +
          'compiler is not available. Either pre-compile the templates into ' +
          'render functions, or use the compiler-included build.',
          vm
        )
      } else {
        // 没有获取到vue的模板文�?        warn(
          'Failed to mount component: template or render function not defined.',
          vm
        )
      }
    }
  }
  // 执行beforeMount钩子
  callHook(vm, 'beforeMount')

  let updateComponent
  /* istanbul ignore if */
  if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
    updateComponent = () => {
      const name = vm._name
      const id = vm._uid
      const startTag = `vue-perf-start:${id}`
      const endTag = `vue-perf-end:${id}`

      mark(startTag)
      const vnode = vm._render()
      mark(endTag)
      measure(`vue ${name} render`, startTag, endTag)

      mark(startTag)
      vm._update(vnode, hydrating)
      mark(endTag)
      measure(`vue ${name} patch`, startTag, endTag)
    }
  } else {
    // 定义更新函数
    updateComponent = () => {
      // 实际调⽤是在lifeCycleMixin中定义的_update和renderMixin中定义的_render
      vm._update(vm._render(), hydrating)
    }
  }
  // we set this to vm._watcher inside the watcher's constructor
  // since the watcher's initial patch may call $forceUpdate (e.g. inside child
  // component's mounted hook), which relies on vm._watcher being already defined
  // 监听当前组件状态，当有数据变化时，更新组件
  new Watcher(vm, updateComponent, noop, {
    before () {
      if (vm._isMounted && !vm._isDestroyed) {
        // 数据更新引发的组件更�?        callHook(vm, 'beforeUpdate')
      }
    }
  }, true /* isRenderWatcher */)
  hydrating = false

  // manually mounted instance, call mounted on self
  // mounted is called for render-created child components in its inserted hook
  if (vm.$vnode == null) {
    vm._isMounted = true
    callHook(vm, 'mounted')
  }
  return vm
}

// 定义vue 原型上的render方法
Vue.prototype._render = function (): VNode {
    const vm: Component = this
    // render函数来自于组件的option
    const { render, _parentVnode } = vm.$options

    if (_parentVnode) {
        vm.$scopedSlots = normalizeScopedSlots(
            _parentVnode.data.scopedSlots,
            vm.$slots,
            vm.$scopedSlots
        )
    }

    // set parent vnode. this allows render functions to have access
    // to the data on the placeholder node.
    vm.$vnode = _parentVnode
    // render self
    let vnode
    try {
        // There's no need to maintain a stack because all render fns are called
        // separately from one another. Nested component's render fns are called
        // when parent component is patched.
        currentRenderingInstance = vm
        // 调用render方法，自己的独特的render方法�?传入createElement参数，生成vNode
        vnode = render.call(vm._renderProxy, vm.$createElement)
    } catch (e) {
        handleError(e, vm, `render`)
        // return error render result,
        // or previous vnode to prevent render error causing blank component
        /* istanbul ignore else */
        if (process.env.NODE_ENV !== 'production' && vm.$options.renderError) {
            try {
                vnode = vm.$options.renderError.call(vm._renderProxy, vm.$createElement, e)
            } catch (e) {
                handleError(e, vm, `renderError`)
                vnode = vm._vnode
            }
        } else {
            vnode = vm._vnode
        }
    } finally {
        currentRenderingInstance = null
    }
    // if the returned array contains only a single node, allow it
    if (Array.isArray(vnode) && vnode.length === 1) {
        vnode = vnode[0]
    }
    // return empty vnode in case the render function errored out
    if (!(vnode instanceof VNode)) {
        if (process.env.NODE_ENV !== 'production' && Array.isArray(vnode)) {
            warn(
                'Multiple root nodes returned from render function. Render function ' +
                'should return a single root node.',
                vm
            )
        }
        vnode = createEmptyVNode()
    }
    // set parent
    vnode.parent = _parentVnode
    return vnode
}

Vue.prototype._update = function (vnode: VNode, hydrating?: boolean) {
    const vm: Component = this
    const prevEl = vm.$el
    const prevVnode = vm._vnode
    // 设置当前激活的作用�?    const restoreActiveInstance = setActiveInstance(vm)
    vm._vnode = vnode
    // Vue.prototype.__patch__ is injected in entry points
    // based on the rendering backend used.
    if (!prevVnode) {
      // initial render
      // 执行具体的挂载逻辑
      vm.$el = vm.__patch__(vm.$el, vnode, hydrating, false /* removeOnly */)
    } else {
      // updates
      vm.$el = vm.__patch__(prevVnode, vnode)
    }
    restoreActiveInstance()
    // update __vue__ reference
    if (prevEl) {
      prevEl.__vue__ = null
    }
    if (vm.$el) {
      vm.$el.__vue__ = vm
    }
    // if parent is an HOC, update its $el as well
    if (vm.$vnode && vm.$parent && vm.$vnode === vm.$parent._vnode) {
      vm.$parent.$el = vm.$el
    }
    // updated hook is called by the scheduler to ensure that children are
    // updated in a parent's updated hook.
  }

const vm = new Vue({
  el: '#app',
  data: {
    message: '原始�?
  }
})

this.message = '修改后的�?'
this.message = '修改后的�?'
this.message = '修改后的�?'

console.log(vm.$el.textContent) // 原始�?```

这是因为`message`数据在发现变化的时候，`vue`并不会立刻去更新`Dom`，而是将修改数据的操作放在了一个异步操作队列中

如果我们一直修改相同数据，异步操作队列还会进行去重

等待同一事件循环中的所有数据变化完成之后，会将队列中的事件拿来进行处理，进行`DOM`的更�?
#### 为什么要有nexttick

举个例子
```js
{{num}}
for(let i=0; i<100000; i++){
    num = i
}

// 修改数据
vm.message = '修改后的�?
// DOM 还没有更�?console.log(vm.$el.textContent) // 原始的�?Vue.nextTick(function () {
  // DOM 更新�?  console.log(vm.$el.textContent) // 修改后的�?})

this.message = '修改后的�?
console.log(this.$el.textContent) // => '原始的�?
this.$nextTick(function () {
    console.log(this.$el.textContent) // => '修改后的�?
})

this.message = '修改后的�?
console.log(this.$el.textContent) // => '原始的�?
await this.$nextTick()
console.log(this.$el.textContent) // => '修改后的�?

export function nextTick(cb?: Function, ctx?: Object) {
  let _resolve;

  // cb 回调函数会经统一处理压入 callbacks 数组
  callbacks.push(() => {
    if (cb) {
      // �?cb 回调函数执行加上�?try-catch 错误处理
      try {
        cb.call(ctx);
      } catch (e) {
        handleError(e, ctx, 'nextTick');
      }
    } else if (_resolve) {
      _resolve(ctx);
    }
  });

  // 执行异步延迟函数 timerFunc
  if (!pending) {
    pending = true;
    timerFunc();
  }

  // �?nextTick 没有传入函数参数的时候，返回一�?Promise 化的调用
  if (!cb && typeof Promise !== 'undefined') {
    return new Promise(resolve => {
      _resolve = resolve;
    });
  }
}

export let isUsingMicroTask = false
if (typeof Promise !== 'undefined' && isNative(Promise)) {
  //判断1：是否原生支持Promise
  const p = Promise.resolve()
  timerFunc = () => {
    p.then(flushCallbacks)
    if (isIOS) setTimeout(noop)
  }
  isUsingMicroTask = true
} else if (!isIE && typeof MutationObserver !== 'undefined' && (
  isNative(MutationObserver) ||
  MutationObserver.toString() === '[object MutationObserverConstructor]'
)) {
  //判断2：是否原生支持MutationObserver
  let counter = 1
  const observer = new MutationObserver(flushCallbacks)
  const textNode = document.createTextNode(String(counter))
  observer.observe(textNode, {
    characterData: true
  })
  timerFunc = () => {
    counter = (counter + 1) % 2
    textNode.data = String(counter)
  }
  isUsingMicroTask = true
} else if (typeof setImmediate !== 'undefined' && isNative(setImmediate)) {
  //判断3：是否原生支持setImmediate
  timerFunc = () => {
    setImmediate(flushCallbacks)
  }
} else {
  //判断4：上面都不行，直接用setTimeout
  timerFunc = () => {
    setTimeout(flushCallbacks, 0)
  }
}

function flushCallbacks () {
  pending = false
  const copies = callbacks.slice(0)
  callbacks.length = 0
  for (let i = 0; i < copies.length; i++) {
    copies[i]()
  }
}

Vue.observable({ count : 1})

new vue({ count : 1})

// 引入vue
import Vue from 'vue
// 创建state对象，使用observable让state对象可响�?export let state = Vue.observable({
  name: '张三',
  'age': 38
})
// 创建对应的方�?export let mutations = {
  changeName(name) {
    state.name = name
  },
  setAge(age) {
    state.age = age
  }
}

<template>
  <div>
    姓名：{{ name }}
    年龄：{{ age }}
    <button @click="changeName('李四')">改变姓名</button>
    <button @click="setAge(18)">改变年龄</button>
  </div>
</template>
import { state, mutations } from '@/store
export default {
  // 在计算属性中拿到�?  computed: {
    name() {
      return state.name
    },
    age() {
      return state.age
    }
  },
  // 调用mutations里面的方法，更新数据
  methods: {
    changeName: mutations.changeName,
    setAge: mutations.setAge
  }
}

export function observe (value: any, asRootData: ?boolean): Observer | void {
  if (!isObject(value) || value instanceof VNode) {
    return
  }
  let ob: Observer | void
  // 判断是否存在__ob__响应式属�?  if (hasOwn(value, '__ob__') && value.__ob__ instanceof Observer) {
    ob = value.__ob__
  } else if (
    shouldObserve &&
    !isServerRendering() &&
    (Array.isArray(value) || isPlainObject(value)) &&
    Object.isExtensible(value) &&
    !value._isVue
  ) {
    // 实例化Observer响应式对�?    ob = new Observer(value)
  }
  if (asRootData && ob) {
    ob.vmCount++
  }
  return ob
}

export class Observer {
    value: any;
    dep: Dep;
    vmCount: number; // number of vms that have this object as root $data

    constructor (value: any) {
        this.value = value
        this.dep = new Dep()
        this.vmCount = 0
        def(value, '__ob__', this)
        if (Array.isArray(value)) {
            if (hasProto) {
                protoAugment(value, arrayMethods)
            } else {
                copyAugment(value, arrayMethods, arrayKeys)
            }
            this.observeArray(value)
        } else {
            // 实例化对象是一个对象，进入walk方法
            this.walk(value)
        }
}

walk (obj: Object) {
    const keys = Object.keys(obj)
    // 遍历key，通过defineReactive创建响应式对�?    for (let i = 0; i < keys.length; i++) {
        defineReactive(obj, keys[i])
    }
}

export function defineReactive (
  obj: Object,
  key: string,
  val: any,
  customSetter?: ?Function,
  shallow?: boolean
) {
  const dep = new Dep()

  const property = Object.getOwnPropertyDescriptor(obj, key)
  if (property && property.configurable === false) {
    return
  }

  // cater for pre-defined getter/setters
  const getter = property && property.get
  const setter = property && property.set
  if ((!getter || setter) && arguments.length === 2) {
    val = obj[key]
  }

  let childOb = !shallow && observe(val)
  // 接下来调用Object.defineProperty()给对象定义响应式属�?  Object.defineProperty(obj, key, {
    enumerable: true,
    configurable: true,
    get: function reactiveGetter () {
      const value = getter ? getter.call(obj) : val
      if (Dep.target) {
        dep.depend()
        if (childOb) {
          childOb.dep.depend()
          if (Array.isArray(value)) {
            dependArray(value)
          }
        }
      }
      return value
    },
    set: function reactiveSetter (newVal) {
      const value = getter ? getter.call(obj) : val
      /* eslint-disable no-self-compare */
      if (newVal === value || (newVal !== newVal && value !== value)) {
        return
      }
      /* eslint-enable no-self-compare */
      if (process.env.NODE_ENV !== 'production' && customSetter) {
        customSetter()
      }
      // #7981: for accessor properties without setter
      if (getter && !setter) return
      if (setter) {
        setter.call(obj, newVal)
      } else {
        val = newVal
      }
      childOb = !shallow && observe(newVal)
      // 对观察者watchers进行通知,state就成了全局响应式对�?      dep.notify()
    }
  })
}

axios.interceptors.request.use(config => {
    config.headers['token'] = cookie.get('token')
    return config
})
axios.interceptors.response.use(res=>{},{response}=>{
    if (response.data.code === 40099 || response.data.code === 40098) { //token过期或者错�?        router.push('/login')
    }
})

const routerMap = [
  {
    path: '/permission',
    component: Layout,
    redirect: '/permission/index',
    alwaysShow: true, // will always show the root menu
    meta: {
      title: 'permission',
      icon: 'lock',
      roles: ['admin', 'editor'] // you can set roles in root nav
    },
    children: [{
      path: 'page',
      component: () => import('@/views/permission/page'),
      name: 'pagePermission',
      meta: {
        title: 'pagePermission',
        roles: ['admin'] // or you can only set roles in sub nav
      }
    }, {
      path: 'directive',
      component: () => import('@/views/permission/directive'),
      name: 'directivePermission',
      meta: {
        title: 'directivePermission'
        // if do not set roles, means: this page does not require permission
      }
    }]
  }]

import router from './router'
import store from './store'
import { Message } from 'element-ui'
import NProgress from 'nprogress' // progress bar
import 'nprogress/nprogress.css'// progress bar style
import { getToken } from '@/utils/auth' // getToken from cookie

NProgress.configure({ showSpinner: false })// NProgress Configuration

// permission judge function
function hasPermission(roles, permissionRoles) {
  if (roles.indexOf('admin') >= 0) return true // admin permission passed directly
  if (!permissionRoles) return true
  return roles.some(role => permissionRoles.indexOf(role) >= 0)
}

const whiteList = ['/login', '/authredirect']// no redirect whitelist

router.beforeEach((to, from, next) => {
  NProgress.start() // start progress bar
  if (getToken()) { // determine if there has token
    /* has token*/
    if (to.path === '/login') {
      next({ path: '/' })
      NProgress.done() // if current page is dashboard will not trigger	afterEach hook, so manually handle it
    } else {
      if (store.getters.roles.length === 0) { // 判断当前用户是否已拉取完user_info信息
        store.dispatch('GetUserInfo').then(res => { // 拉取user_info
          const roles = res.data.roles // note: roles must be a array! such as: ['editor','develop']
          store.dispatch('GenerateRoutes', { roles }).then(() => { // 根据roles权限生成可访问的路由�?            router.addRoutes(store.getters.addRouters) // 动态添加可访问路由�?            next({ ...to, replace: true }) // hack方法 确保addRoutes已完�?,set the replace: true so the navigation will not leave a history record
          })
        }).catch((err) => {
          store.dispatch('FedLogOut').then(() => {
            Message.error(err || 'Verification failed, please login again')
            next({ path: '/' })
          })
        })
      } else {
        // 没有动态改变权限的需求可直接next() 删除下方权限判断 �?        if (hasPermission(store.getters.roles, to.meta.roles)) {
          next()//
        } else {
          next({ path: '/401', replace: true, query: { noGoBack: true }})
        }
        // 可删 �?      }
    }
  } else {
    /* has no token*/
    if (whiteList.indexOf(to.path) !== -1) { // 在免登录白名单，直接进入
      next()
    } else {
      next('/login') // 否则全部重定向到登录�?      NProgress.done() // if current page is login will not trigger afterEach hook, so manually handle it
    }
  }
})

router.afterEach(() => {
  NProgress.done() // finish progress bar
})

{
    name: "login",
    path: "/login",
    component: () => import("@/pages/Login.vue")
}

function hasPermission(router, accessMenu) {
  if (whiteList.indexOf(router.path) !== -1) {
    return true;
  }
  let menu = Util.getMenuByName(router.name, accessMenu);
  if (menu.name) {
    return true;
  }
  return false;

}

Router.beforeEach(async (to, from, next) => {
  if (getToken()) {
    let userInfo = store.state.user.userInfo;
    if (!userInfo.name) {
      try {
        await store.dispatch("GetUserInfo")
        await store.dispatch('updateAccessMenu')
        if (to.path === '/login') {
          next({ name: 'home_index' })
        } else {
          //Util.toDefaultPage([...routers], to.name, router, next);
          next({ ...to, replace: true })//菜单权限更新完成,重新进一次当前路�?        }
      }  
      catch (e) {
        if (whiteList.indexOf(to.path) !== -1) { // 在免登录白名单，直接进入
          next()
        } else {
          next('/login')
        }
      }
    } else {
      if (to.path === '/login') {
        next({ name: 'home_index' })
      } else {
        if (hasPermission(to, store.getters.accessMenu)) {
          Util.toDefaultPage(store.getters.accessMenu,to, routes, next);
        } else {
          next({ path: '/403',replace:true })
        }
      }
    }
  } else {
    if (whiteList.indexOf(to.path) !== -1) { // 在免登录白名单，直接进入
      next()
    } else {
      next('/login')
    }
  }
  let menu = Util.getMenuByName(to.name, store.getters.accessMenu);
  Util.title(menu.title);
});

Router.afterEach((to) => {
  window.scrollTo(0, 0);
});

const Home = () => import("../pages/Home.vue");
const UserInfo = () => import("../pages/UserInfo.vue");
export default {
    home: Home,
    userInfo: UserInfo
};

[
    {
        name: "home",
        path: "/",
        component: "home"
    },
    {
        name: "home",
        path: "/userinfo",
        component: "userInfo"
    }
]

{
    path: '/permission',
    component: Layout,
    name: '权限测试',
    meta: {
        btnPermissions: ['admin', 'supper', 'normal']
    },
    //页面需要的权限
    children: [{
        path: 'supper',
        component: _import('system/supper'),
        name: '权限测试�?,
        meta: {
            btnPermissions: ['admin', 'supper']
        } //页面需要的权限
    },
    {
        path: 'normal',
        component: _import('system/normal'),
        name: '权限测试�?,
        meta: {
            btnPermissions: ['admin']
        } //页面需要的权限
    }]
}

import Vue from 'vue'
/**权限指令**/
const has = Vue.directive('has', {
    bind: function (el, binding, vnode) {
        // 获取页面按钮权限
        let btnPermissionsArr = [];
        if(binding.value){
            // 如果指令传值，获取指令参数，根据指令参数和当前登录人按钮权限做比较�?            btnPermissionsArr = Array.of(binding.value);
        }else{
            // 否则获取路由中的参数，根据路由的btnPermissionsArr和当前登录人按钮权限做比较�?            btnPermissionsArr = vnode.context.$route.meta.btnPermissions;
        }
        if (!Vue.prototype.$_has(btnPermissionsArr)) {
            el.parentNode.removeChild(el);
        }
    }
});
// 权限检查方�?Vue.prototype.$_has = function (value) {
    let isExist = false;
    // 获取用户按钮权限
    let btnPermissionsStr = sessionStorage.getItem("btnPermissions");
    if (btnPermissionsStr == undefined || btnPermissionsStr == null) {
        return false;
    }
    if (value.indexOf(btnPermissionsStr) > -1) {
        isExist = true;
    }
    return isExist;
};
export {has}