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| ## Vue源码学习前置知识 | ||
| * 以下是我整理的Vue源码学习前置知识：Flow、DefineProperty、Vnode、类继承、递归、代理。可以针对这些点先好好理解一下。 | ||
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| ## Flow | ||
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| ```vuejs | ||
| // 摘自源码中src/core/config.js | ||
| export type Config = { | ||
| // user | ||
| optionMergeStrategies: { [key: string]: Function }; | ||
| silent: boolean; | ||
| productionTip: boolean; | ||
| performance: boolean; | ||
| devtools: boolean; | ||
| errorHandler: ?(err: Error, vm: Component, info: string) => void; | ||
| warnHandler: ?(msg: string, vm: Component, trace: string) => void; | ||
| ignoredElements: Array<string | RegExp>; | ||
| keyCodes: { [key: string]: number | Array<number> }; | ||
| // platform | ||
| isReservedTag: (x?: string) => boolean; | ||
| isReservedAttr: (x?: string) => boolean; | ||
| parsePlatformTagName: (x: string) => string; | ||
| isUnknownElement: (x?: string) => boolean; | ||
| getTagNamespace: (x?: string) => string | void; | ||
| mustUseProp: (tag: string, type: ?string, name: string) => boolean; | ||
| // private | ||
| async: boolean; | ||
| // legacy | ||
| _lifecycleHooks: Array<string>; | ||
| }; | ||
| ``` | ||
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| ## DefineProperty | ||
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| ```vuejs | ||
| // 摘自源码中src/core/instance/state.js | ||
| Object.defineProperty(Vue.prototype, '$data', dataDef) | ||
| Object.defineProperty(Vue.prototype, '$props', propsDef) | ||
| // 摘自源码中src/core/observer/index.js | ||
| 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) | ||
| dep.notify() | ||
| } | ||
| }) | ||
| ``` | ||
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| ## Vnode | ||
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| ```vuejs | ||
| // 摘自源码中src/core/vdom/vnode.js | ||
| export default class VNode { | ||
| tag: string | void; | ||
| data: VNodeData | void; | ||
| children: ?Array<VNode>; | ||
| text: string | void; | ||
| elm: Node | void; | ||
| ns: string | void; | ||
| context: Component | void; // rendered in this component's scope | ||
| key: string | number | void; | ||
| componentOptions: VNodeComponentOptions | void; | ||
| componentInstance: Component | void; // component instance | ||
| parent: VNode | void; // component placeholder node | ||
| // 省略 | ||
| } | ||
| ``` | ||
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| ## 类继承 | ||
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| ```vuejs | ||
| // 摘自源码中src/core/global-api/extend.js | ||
| Vue.extend = function (extendOptions: Object): Function { | ||
| extendOptions = extendOptions || {} | ||
| const Super = this | ||
| const SuperId = Super.cid | ||
| // 省略 | ||
| Sub.prototype = Object.create(Super.prototype) | ||
| Sub.prototype.constructor = Sub | ||
| Sub.cid = cid++ | ||
| Sub.options = mergeOptions( | ||
| Super.options, | ||
| extendOptions | ||
| ) | ||
| Sub['super'] = Super | ||
| // 省略 | ||
| } | ||
| ``` | ||
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| ## 递归 | ||
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| ```vuejs | ||
| // 摘自源码中src/core/vdom/create-element.js | ||
| function applyNS (vnode, ns, force) { | ||
| vnode.ns = ns | ||
| if (vnode.tag === 'foreignObject') { | ||
| // use default namespace inside foreignObject | ||
| ns = undefined | ||
| force = true | ||
| } | ||
| if (isDef(vnode.children)) { | ||
| for (let i = 0, l = vnode.children.length; i < l; i++) { | ||
| const child = vnode.children[i] | ||
| if (isDef(child.tag) && ( | ||
| isUndef(child.ns) || (isTrue(force) && child.tag !== 'svg'))) { | ||
| applyNS(child, ns, force) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| ``` | ||
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| ## 代理 | ||
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| ```vuejs | ||
| // 摘自源码中src/core/instance/proxy.js | ||
| initProxy = function initProxy (vm) { | ||
| if (hasProxy) { | ||
| // determine which proxy handler to use | ||
| const options = vm.$options | ||
| const handlers = options.render && options.render._withStripped | ||
| ? getHandler | ||
| : hasHandler | ||
| vm._renderProxy = new Proxy(vm, handlers) | ||
| } else { | ||
| vm._renderProxy = vm | ||
| } | ||
| } | ||
| ``` | ||
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| ## 相关 | ||
| * [https://juejin.im/post/5b4ad441f265da0f7d4eeb7a](https://juejin.im/post/5b4ad441f265da0f7d4eeb7a) | ||
| * [https://www.jianshu.com/p/c914ccd498e7](https://www.jianshu.com/p/c914ccd498e7) | ||
| * [https://blog.csdn.net/qq_24122593/article/details/53197288](https://blog.csdn.net/qq_24122593/article/details/53197288) |
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