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mini-vue
Commit 42d0e703 authored by 尚斌杰's avatar 尚斌杰
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index.html 0 → 100644
View file @ 42d0e703
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Mini Vue</title>
</head>
<body>
<div id="app">
<h1>插值表达式</h1>
<h3>{{ msg }}</h3>
<h3>{{ count }}</h3>
<h1>v-text</h1>
<div v-text="msg"></div>
<h1>v-html</h1>
<div v-html="htmlContent"></div>
<h1>v-model</h1>
<input type="text" v-model="msg">
<input type="text" v-model="count">
<h1>v-on:click</h1>
<button v-on:click="handlerClick">click me</button>
<h1>v-on:focus</h1>
<input type="text" v-on:focus="handlerFocus">
</div>
<script src="./js/dep.js"></script>
<script src="./js/watcher.js"></script>
<script src="./js/compiler.js"></script>
<script src="./js/observer.js"></script>
<script src="./js/vue.js"></script>
<script>
let vm = new Vue({
el: '#app',
data: {
msg: 'Hello Vue',
count: 100,
person: { name: 'lxc' },
htmlContent: '<p style="color: #f00;">This is a piece of html code</p>',
handlerClick: () => {
alert('You clicked me~')
},
handlerFocus: () => {
console.log('focus input');
},
}
})
// vm.msg = { test: 'xxx' }
// console.log(vm.msg);
console.log(vm.arr);
// vm.arr.length = 0
</script>
</body>
</html>
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js/compiler.js 0 → 100644
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class Compiler {
constructor (vm) {
this.$el = vm.$el
this.vm = vm
this.compile(this.$el)
}
// 编译模板，处理文本节点和元素节点
compile (el) {
let childNodes = el.childNodes
Array.from(childNodes).forEach(node => {
// 处理文本节点
if (this.isTextNode(node)) {
this.compileText(node)
} else if (this.isElementNode(node)) {
// 处理元素节点
this.compileElement(node)
}
// 判断node节点，是否有子节点，如果有子节点，要递归调用compile
if (node.childNodes && node.childNodes.length) {
this.compile(node)
}
})
}
// 编译元素节点，处理指令
compileElement (node) {
// console.log(node.attributes);
// 遍历所有的属性节点
Array.from(node.attributes).forEach(attr => {
// 判断是否是指令
let attrName = attr.name
if (this.isDirective(attrName)) {
// v-text --> text
attrName = attrName.substr(2)
let key = attr.value
this.update(node, key, attrName)
}
})
}
update (node, key, attrName) {
let updateFn = this[attrName + 'Updater']
updateFn && updateFn.call(this, node, this.vm[key], key)
// 处理 v-on 指令 attrName => on:click
if (attrName.startsWith('on:')) {
const eventType = attrName.split(':')[1]
this.onUpdater(node, this.vm[key], key, eventType)
}
}
// 处理 v-text 指令
textUpdater (node, value, key) {
node.textContent = value
new Watcher(this.vm, key, (newValue) => {
node.textContent = newValue
})
}
// 处理 v-model 指令
modelUpdater (node, value, key) {
node.value = value
new Watcher(this.vm, key, (newValue) => {
node.value = newValue
})
// 双向绑定
node.addEventListener('input', () => {
this.vm[key] = node.value
})
}
// 处理 v-html 指令
htmlUpdater (node, value, key) {
node.innerHTML = value
new Watcher(this.vm, key, newValue => {
node.innerHTML = newValue
})
}
// 处理 v-on 指令
onUpdater (node, value, key, eventType) {
node.addEventListener(eventType, value)
new Watcher(this.vm, key, newValue => {
node.removeEventListener(eventType, value)
node.addEventListener(eventType, newValue)
})
}
// 编译文本节点，处理插值表达式
compileText (node) {
// console.dir(node);
// {{ msg }}
let reg = /\{\{(.+?)\}\}/
let value = node.textContent
if (reg.test(value)) {
let key = RegExp.$1.trim()
node.textContent = value.replace(reg, this.vm[key])
// 创建watcher对象，当数据改变更新视图
new Watcher(this.vm, key, (newValue) => {
node.textContent = newValue
})
}
}
// 判断元素属性是否是指令
isDirective (attrName) {
return attrName.startsWith('v-')
}
// 判断节点是否是文本节点
isTextNode (node) {
return node.nodeType === 3
}
// 判断节点是否是元素节点
isElementNode (node) {
return node.nodeType === 1
}
}
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js/dep.js 0 → 100644
View file @ 42d0e703
class Dep {
constructor () {
// 存储所有的观察者
this.subs = []
}
// 添加观察者
addSub (sub) {
if (sub && sub.update) {
this.subs.push(sub)
}
}
// 发送通知
notify () {
this.subs.forEach(sub => {
sub.update()
})
}
}
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js/observer.js 0 → 100644
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class Observer {
constructor (data) {
this.walk(data)
}
walk (data) {
// 1. 判断data是否是对象
if (!data || typeof data !== 'object') return
// 2. 遍历data对象的所有属性
Object.keys(data).forEach(key => {
this.defineReactive(data, key, data[key])
})
}
defineReactive (obj, key, val) {
let that = this
// 负责收集依赖，并发送通知
let dep = new Dep()
// 如果val是对象，把val内部的属性转换成响应式数据
this.walk(val)
Object.defineProperty(obj, key, {
enumerable: true,
configurable: true,
get () {
// 收集依赖
Dep.target && dep.addSub(Dep.target)
return val
},
set (newValue) {
if (newValue === val) return
val = newValue
that.walk(newValue)
// 发送通知
dep.notify()
}
})
}
}
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js/vue.js 0 → 100644
View file @ 42d0e703
class Vue {
constructor (options) {
// 1. 通过属性保存选项的数据
this.$options = options || {}
this.$data = options.data || {}
this.$el = typeof options.el === 'string' ? document.querySelector(options.el) : options.el
// 2. 把 data 中的成员转换成 getter 和 setter，注入到 vue 实例中
this._proxyData(this.$data)
// 3.调用 observer 对象，监听数据的变化
new Observer(this.$data)
// 4. 调用 compiler 对象，解析指令和插值表达式
new Compiler(this)
}
_proxyData (data) {
// 遍历data中的所有属性
Object.keys(data).forEach(key => {
// 把data的属性注入到vue实例中
Object.defineProperty(this, key, {
enumerable: true,
configurable: true,
get () {
return data[key]
},
set (newValue) {
if (newValue === data[key]) return
data[key] = newValue
}
})
})
}
}
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js/watcher.js 0 → 100644
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class Watcher {
constructor (vm, key, cb) {
this.vm = vm
// data 中的属性名称
this.key = key
// 回调函数负责更新视图
this.cb = cb
// 把 watcher 对象记录到 Dep 类的静态属性 target
Dep.target = this
// 触发get方法，在get方法中会调用 addSub
this.oldValue = vm[key]
Dep.target = null
}
// 当数据发生变化的时候更新视图
update () {
let newValue = this.vm[this.key]
if (this.oldValue === newValue) return
this.cb(newValue)
}
}
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