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    1. Vue.prototype._init = function (options?: Object) {
    2.   const vm: Component = this
    3.   // a uid
    4.   vm._uid = uid++
    6.   let startTag, endTag
    7.   /* istanbul ignore if */
    8.   if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
    9.     startTag = `vue-perf-start:${vm._uid}`
    10.     endTag = `vue-perf-end:${vm._uid}`
    11.     mark(startTag)
    12.   }
    14.   // a flag to avoid this being observed
    15.   vm._isVue = true
    16.   // 合并配置项
    17.   if (options && options._isComponent) {
    18.     // optimize internal component instantiation
    19.     // since dynamic options merging is pretty slow, and none of the
    20.     // internal component options needs special treatment.
    21.     initInternalComponent(vm, options)
    22.   } else {
    23.     vm.$options = mergeOptions(
    24.       resolveConstructorOptions(vm.constructor),
    25.       options || {},
    26.       vm
    27.     )
    28.   }
    29.   /* istanbul ignore else */
    30.   if (process.env.NODE_ENV !== 'production') {
    31.     initProxy(vm) // 开发环境初始化代理配置
    32.   } else {
    33.     vm._renderProxy = vm
    34.   }
    35.   // expose real self
    36.   vm._self = vm
    37.   initLifecycle(vm) // 初始化生命周期
    38.   initEvents(vm) // 初始化事件中心
    39.   initRender(vm) // 初始化渲染
    40.   callHook(vm, 'beforeCreate') // beforeCreate生命周期
    41.   initInjections(vm) // resolve injections before data/props
    42.   initState(vm) // 初始化props、methods、data、computed、watch
    43.   initProvide(vm) // resolve provide after data/props
    44.   callHook(vm, 'created') // created生命周期
    46.   /* istanbul ignore if */
    47.   if (process.env.NODE_ENV !== 'production' && config.performance && mark) {
    48.     vm._name = formatComponentName(vm, false)
    49.     mark(endTag)
    50.     measure(`vue ${vm._name} init`, startTag, endTag)
    51.   }
    53.   if (vm.$options.el) {
    54.     vm.$mount(vm.$options.el)
    55.   }
    56. }