源码小结

1. oberver/array.js

/*
 * not type checking this file because flow doesn't play well with
 * dynamically accessing methods on Array prototype
 */

function def (obj, key, val, enumerable) {
  Object.defineProperty(obj, key, {
    value: val,
    enumerable: !!enumerable,
    writable: true,
    configurable: true
  })
}

const arrayProto = Array.prototype
const arrayMethods = Object.create(arrayProto)

const methodsToPatch = [
  'push',
  'pop',
  'shift',
  'unshift',
  'splice',
  'sort',
  'reverse'
]

// /**
//  * Intercept mutating methods and emit events
//  */
methodsToPatch.forEach(function (method) {
  // cache original method
  const original = arrayProto[method]
  console.log('methods:', method)
  // 重写数组原生态的方法。
  def(arrayMethods, method, function mutator (...args) {
    const result = original.apply(this, args)
    console.log('this:=', this)
    console.log('args=:', args)
    let inserted
    switch (method) {
      case 'push':
      case 'unshift':
        inserted = args
        break
      case 'splice':
        inserted = args.slice(2)
        break
    }
    return result
  })
})
const arrayKeys = Object.getOwnPropertyNames(arrayMethods)
var arr1 = [1, 3, 4, 9]
// 实例对象挂上
arr1.__proto__ = arrayMethods
console.log('arr1=', arr1.slice(2))

core/index.js　

// 两层意思，1 个Vue.挂个静态成员FunctionalRenderContext
function Vue () {

}
function FunctionalRenderContext () {
    console.log('hello world')
}
Object.defineProperty(Vue, 'FunctionalRenderContext', {
  value: FunctionalRenderContext
})
FunctionalRenderContext.prototype = {
    _o:function () {
        console.log('o is:o')
    },
    _k: function () {
        console.log('k is: k')
    }
}
// Vue.FunctionalRenderContext();
var o = new Vue.FunctionalRenderContext()
o._o()