了解一下vue源码中vue 的由来

 我们之前提到过 Vue.js 构建过程，在 web 应用下，我们来分析 Runtime + Compiler 构建出来的 Vue.js，它的入口是

src/platforms/web/entry-runtime-with-compiler.js：

1，查看入口文件的代码--流程图

 我们可以看下 instance/index 的代码

import { initMixin } from './init'

import { stateMixin } from './state'

import { renderMixin } from './render'

import { eventsMixin } from './events'

import { lifecycleMixin } from './lifecycle'

import { warn } from '../util/index'

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)

stateMixin(Vue)

eventsMixin(Vue)

lifecycleMixin(Vue)

renderMixin(Vue)

到这里我们可以看到vue是function 

他传到各个方法中，

vue是根据原型的特性propotype,进行扩展

'./global-api/index' 

import Vue from './instance/index'

import { initGlobalAPI } from './global-api/index'

import { isServerRendering } from 'core/util/env'

import { FunctionalRenderContext } from 'core/vdom/create-functional-component'

initGlobalAPI(Vue)

这里对 initGlobalAPI里面的方法进行解读

  const configDef = {}

  configDef.get = () => config

  if (process.env.NODE_ENV !== 'production') {

    configDef.set = () => {

      warn(

        'Do not replace the Vue.config object, set individual fields instead.'

      )

    }

  }

  Object.defineProperty(Vue, 'config', configDef)

   // exposed util methods.

  // NOTE: these are not considered part of the    public API - avoid relying on

  // them unless you are aware of the risk.

  Vue.util = {

    warn,

    extend,

    mergeOptions,

    defineReactive

  }

  Vue.set = set

  Vue.delete = del

  Vue.nextTick = nextTick

  Vue.options = Object.create(null)

  ASSET_TYPES.forEach(type => {

    Vue.options[type + 's'] = Object.create(null)

  })

对于vue的全局的一种定义