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) }
// merge options 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 { vm.$options = mergeOptions( resolveConstructorOptions(vm.constructor), options || {}, vm ) }
// 这里先mark,后续准备写一下[写Proxy在Vue中的实践],到时候细看
/* istanbul ignore else */ if (process.env.NODE_ENV !== 'production') { initProxy(vm) } else { vm._renderProxy = vm } // expose real self vm._self = vm
initLifecycle(vm) initEvents(vm) initRender(vm) callHook(vm, 'beforeCreate') initInjections(vm) // resolve injections before data/props initState(vm) initProvide(vm) // resolve provide after data/props callHook(vm, 'created')
// 性能追踪 /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && config.performance && mark) { vm._name = formatComponentName(vm, false) mark(endTag) measure(`vue ${vm._name} init`, startTag, endTag) }
if (vm.$options.el) { vm.$mount(vm.$options.el) } }
export functioninitRender(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 vm.$slots = resolveSlots(options._renderChildren, renderContext) vm.$scopedSlots = 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 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. 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