# 入口
# 源码目录
src
|-- compiler # 编译相关
|-- core # 核心代码
|-- platforms # 不同的平台处理
|-- server # 服务端渲染
|-- sfc # .vue 文件解析
|-- shared # 共享的代码
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# 源码构建
# package.json
"build": "node scripts/build.js",
"build:ssr": "npm run build -- web-runtime-cjs,web-server-renderer",
"build:weex": "npm run build -- weex",
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# 构建
// scripts/config.js
// 文件夹绝对路径与其缩写的映射关系
const aliases = require('./alias')
const resolve = p => {
// 取出缩写部分
const base = p.split('/')[0]
if (aliases[base]) {
return path.resolve(aliases[base], p.slice(base.length + 1))
} else {
// 缩写不存在，在当前目录下找
return path.resolve(__dirname, '../', p)
}
}
const builds = {
// Runtime only (CommonJS). Used by bundlers e.g. Webpack & Browserify
'web-runtime-cjs-dev': {
// 入口
entry: resolve('web/entry-runtime.js'),
// 打包后的路径
dest: resolve('dist/vue.runtime.common.dev.js'),
// 构建格式
format: 'cjs',
env: 'development',
banner
},
'web-runtime-cjs-prod': {
entry: resolve('web/entry-runtime.js'),
dest: resolve('dist/vue.runtime.common.prod.js'),
format: 'cjs',
env: 'production',
banner
},
// Runtime+compiler CommonJS build (CommonJS)
'web-full-cjs-dev': {
entry: resolve('web/entry-runtime-with-compiler.js'),
dest: resolve('dist/vue.common.dev.js'),
format: 'cjs',
env: 'development',
alias: { he: './entity-decoder' },
banner
},
...
}
function genConfig (name) {
// 重新组装数据
const opts = builds[name]
const config = {
input: opts.entry,
external: opts.external,
plugins: [
flow(),
alias(Object.assign({}, aliases, opts.alias))
].concat(opts.plugins || []),
output: {
file: opts.dest,
format: opts.format,
banner: opts.banner,
name: opts.moduleName || 'Vue'
},
onwarn: (msg, warn) => {
if (!/Circular/.test(msg)) {
warn(msg)
}
}
}
return config
}
if (process.env.TARGET) {
module.exports = genConfig(process.env.TARGET)
} else {
exports.getBuild = genConfig
exports.getAllBuilds = () => Object.keys(builds).map(genConfig)
}
// scripts/build.js
// 重新组装后的映射关系
let builds = require('./config').getAllBuilds()
// filter builds via command line arg
if (process.argv[2]) {
// 打包命令有参数，过滤不满足条件的
const filters = process.argv[2].split(',')
builds = builds.filter(b => {
return filters.some(f => b.output.file.indexOf(f) > -1 || b._name.indexOf(f) > -1)
})
} else {
// filter out weex builds by default
// 默认不打包 weex
builds = builds.filter(b => {
return b.output.file.indexOf('weex') === -1
})
}
build(builds)
// 依次打包
function build (builds) {
let built = 0
const total = builds.length
const next = () => {
buildEntry(builds[built]).then(() => {
built++
if (built < total) {
next()
}
}).catch(logError)
}
next()
}
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# Runtime Only 与 Runtime + Compiler
- Runtime Only
打包后的代码只包含运行时的代码，运行时不需要对模板进行编译。代码体积较小。
- Runtime + Compiler
在客户端运行时编译模板，代码体积较大。
# Vue 入口
Runtime + Compiler 版本的入口文件在 src/platforms/web/entry-runtime-with-compiler.js
// src/platforms/web/entry-runtime-with-compiler.js
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, {
outputSourceRange: process.env.NODE_ENV !== 'production',
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 ${this._name} compile`, 'compile', 'compile end')
}
}
}
return mount.call(this, el, hydrating)
}
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// src/platforms/web/runtime/index.js
import Vue from 'core/index'
import config from 'core/config'
import { extend, noop } from 'shared/util'
import { mountComponent } from 'core/instance/lifecycle'
import { devtools, inBrowser } from 'core/util/index'
...
Vue.prototype.$mount = function (
el?: string | Element,
hydrating?: boolean
): Component {
el = el && inBrowser ? query(el) : undefined
return mountComponent(this, el, hydrating)
}
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// src/core/index.js
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'
// 初始化全局的静态方法
initGlobalAPI(Vue)
...
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// src/core/instance/index.js
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)
) {
// 不是以构造函数的方式使用
warn('Vue is a constructor and should be called with the `new` keyword')
}
this._init(options)
}
// 原型上添加_init方法
initMixin(Vue)
// 原型上添加 $set、$delete、$watch 等方法。
stateMixin(Vue)
// 原型上添加 $on、$once、$off、$emit 方法。
eventsMixin(Vue)
// 原型上添加 _update、$forceUpdate、$destroy 方法。
lifecycleMixin(Vue)
// 原型上添加 _render、$nextTick 方法。
renderMixin(Vue)
export default Vue
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