vue 原始碼學習系列 二- vue建構函式1
阿新 • • 發佈：2019-01-31
上篇我們找到vue的入口檔案：src/platforms/web/entry-runtime-with-compiler.js
原始碼如下：
/* @flow */ import config from 'core/config' import { warn, cached } from 'core/util/index' import { mark, measure } from 'core/util/perf' import Vue from './runtime/index' import { query } from './util/index' import { compileToFunctions } from './compiler/index' import { shouldDecodeNewlines, shouldDecodeNewlinesForHref } from './util/compat' const idToTemplate = cached(id => { const el = query(id) return el && el.innerHTML }) const mount = Vue.prototype.$mount Vue.prototype.$mount = function ( el?: string | Element, hydrating?: boolean ): Component { el = el && query(el) /* istanbul ignore if */ if (el === document.body || el === document.documentElement) { process.env.NODE_ENV !== 'production' && warn( `Do not mount Vue to <html> or <body> - mount to normal elements instead.` ) return this } const options = this.$options // resolve template/el and convert to render function if (!options.render) { let template = options.template if (template) { if (typeof template === 'string') { if (template.charAt(0) === '#') { template = idToTemplate(template) /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && !template) { warn( `Template element not found or is empty: ${options.template}`, this ) } } } else if (template.nodeType) { template = template.innerHTML } else { if (process.env.NODE_ENV !== 'production') { warn('invalid template option:' + template, this) } return this } } else if (el) { template = getOuterHTML(el) } if (template) { /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && config.performance && mark) { mark('compile') } const { render, staticRenderFns } = compileToFunctions(template, { shouldDecodeNewlines, shouldDecodeNewlinesForHref, delimiters: options.delimiters, comments: options.comments }, this) options.render = render options.staticRenderFns = staticRenderFns /* istanbul ignore if */ if (process.env.NODE_ENV !== 'production' && config.performance && mark) { mark('compile end') measure(`vue ${this._name} compile`, 'compile', 'compile end') } } } return mount.call(this, el, hydrating) } /** * Get outerHTML of elements, taking care * of SVG elements in IE as well. */ function getOuterHTML (el: Element): string { if (el.outerHTML) { return el.outerHTML } else { const container = document.createElement('div') container.appendChild(el.cloneNode(true)) return container.innerHTML } } Vue.compile = compileToFunctions export default Vue
我們看到vue是通過：import Vue from './runtime/index' 宣告的
我們找到 ./runtime/index.js程式碼如下：
/* @flow */ import Vue from 'core/index' import config from 'core/config' import { extend, noop } from 'shared/util' import { mountComponent } from 'core/instance/lifecycle' import { devtools, inBrowser, isChrome } from 'core/util/index' import { query, mustUseProp, isReservedTag, isReservedAttr, getTagNamespace, isUnknownElement } from 'web/util/index' import { patch } from './patch' import platformDirectives from './directives/index' import platformComponents from './components/index' // install platform specific utils Vue.config.mustUseProp = mustUseProp Vue.config.isReservedTag = isReservedTag Vue.config.isReservedAttr = isReservedAttr Vue.config.getTagNamespace = getTagNamespace Vue.config.isUnknownElement = isUnknownElement // install platform runtime directives & components extend(Vue.options.directives, platformDirectives) extend(Vue.options.components, platformComponents) // install platform patch function Vue.prototype.__patch__ = inBrowser ? patch : noop // public mount method Vue.prototype.$mount = function ( el?: string | Element, hydrating?: boolean ): Component { el = el && inBrowser ? query(el) : undefined return mountComponent(this, el, hydrating) } // devtools global hook /* istanbul ignore next */ if (inBrowser) { setTimeout(() => { if (config.devtools) { if (devtools) { devtools.emit('init', Vue) } else if ( process.env.NODE_ENV !== 'production' && process.env.NODE_ENV !== 'test' && isChrome ) { console[console.info ? 'info' : 'log']( 'Download the Vue Devtools extension for a better development experience:\n' + 'https://github.com/vuejs/vue-devtools' ) } } if (process.env.NODE_ENV !== 'production' && process.env.NODE_ENV !== 'test' && config.productionTip !== false && typeof console !== 'undefined' ) { console[console.info ? 'info' : 'log']( `You are running Vue in development mode.\n` + `Make sure to turn on production mode when deploying for production.\n` + `See more tips at https://vuejs.org/guide/deployment.html` ) } }, 0) } export default Vue
同上我們找到：'core/index.js'程式碼如下：
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) Object.defineProperty(Vue.prototype, '$isServer', { get: isServerRendering }) Object.defineProperty(Vue.prototype, '$ssrContext', { get () { /* istanbul ignore next */ return this.$vnode && this.$vnode.ssrContext } }) // expose FunctionalRenderContext for ssr runtime helper installation Object.defineProperty(Vue, 'FunctionalRenderContext', { value: FunctionalRenderContext }) Vue.version = '__VERSION__' export default Vue
接著找到 './instance/index.js'程式碼如下：
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)
export default Vue
繞一大圈終於看到vue的廬山真面了。。。
接下來我們分析一下當我們執行new Vue()的時候到底發生了什麼