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index.html
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<!-- Created by 何文林 on 2018-07-01. -->
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>简单版mvvm</title>
</head>
<body>
<div id="app">
<h1>开发语言：{{language}}</h1>
<h2>组成部分：</h2>
<ul>
<li>{{makeUp.one}}</li>
<li>{{makeUp.two}}</li>
<li>{{makeUp.three}}</li>
</ul>
<h2>描述：</h2>
<p>{{describe}}</p>
<p>计算属性：{{sum}}</p>
<input placeholder="123" v-module="language" />
</div>
<script>
function Mvvm(options = {}) {
this.$options = options
let data = this._data = this.$options.data
let vm = initVm.call(this)
initObserve.call(this, data)
initComputed.call(this)
new Compile(this.$options.el, vm)
mounted.call(this._vm)
return this._vm
}
function initVm () {
this._vm = new Proxy(this, {
get: (target, key, receiver) => {
return this[key] || this._data[key] || this._computed[key]
},
set: (target, key, value) => {
return Reflect.set(this._data, key, value)
}
})
return this._vm
}
function initObserve(data) {
this._data = observe(data)
}
function observe(data) {
if (!data || typeof data !== 'object') return data
return new Observe(data)
}
class Observe {
constructor(data) {
this.dep = new Dep()
for (let key in data) {
data[key] = observe(data[key])
}
return this.proxy(data)
}
proxy(data) {
let dep = this.dep
return new Proxy(data, {
get: (target, prop, receiver) => {
if (Dep.target) {
dep.addSub(Dep.target)
}
return Reflect.get(target, prop, receiver)
},
set: (target, prop, value) => {
const result = Reflect.set(target, prop, observe(value))
dep.notify()
return result
}
})
}
}
class Compile{
constructor (el, vm) {
this.vm = vm
this.element = document.querySelector(el)
this.fragment = document.createDocumentFragment()
this.init()
}
init() {
let element = this.element
this.fragment.append(element)
this.replace(this.fragment)
document.body.appendChild(this.fragment)
}
replace(frag) {
let vm = this.vm
Array.from(frag.childNodes).forEach(node => {
let txt = node.textContent
let reg = /\{\{(.*?)\}\}/g
if (node.nodeType === 1) {
let nodeAttr = node.attributes;
Array.from(nodeAttr).forEach(attr => {
let name = attr.name
let exp = attr.value
if (name.includes('v-')){
node.value = vm[exp]
node.addEventListener('input', e => {
let newVal = e.target.value
// 相当于给this.a赋了一个新值
// 而值的改变会调用set，set中又会调用notify，notify中调用watcher的update方法实现了更新
vm[exp] = newVal
})
}
});
} else if (node.nodeType === 3 && reg.test(txt)) {
replaceTxt()
function replaceTxt() {
node.textContent = txt.replace(reg, (matched, placeholder) => {
new Watcher(vm, placeholder, replaceTxt); // 监听变化，进行匹配替换内容
return placeholder.split('.').reduce((val, key) => {
return val[key]
}, vm)
})
}
}
if (node.childNodes && node.childNodes.length) {
this.replace(node)
}
})
}
}
class Dep {
constructor() {
this.subs = []
}
addSub(sub) {
this.subs.push(sub)
}
notify() {
this.subs.filter(item => typeof item !== 'string').forEach(sub => sub.update())
}
}
class Watcher {
constructor (vm, exp, fn) {
this.fn = fn
this.vm = vm
this.exp = exp
Dep.exp = exp
Dep.target = this
let arr = exp.split('.')
let val = vm
arr.forEach(key => {
val = val[key]
})
Dep.target = null
}
update() {
let exp = this.exp
let arr = exp.split('.')
let val = this.vm
arr.forEach(key => {
val = val[key]
})
this.fn(val)
}
}
function initComputed() {
let vm = this
let computed = this.$options.computed
vm._computed = {}
if (!computed) return
Object.keys(computed).forEach(key => {
this._computed[key] = computed[key].call(this._vm)
new Watcher(this._vm, key, val => {
this._computed[key] = computed[key].call(this._vm)
})
})
}
function mounted() {
let mounted = this.$options.mounted
mounted && mounted.call(this)
}
// 写法和Vue一样
let mvvm = new Mvvm({
el: '#app',
data: {
language: 'Javascript',
makeUp: {
one: 'ECMAScript',
two: '文档对象模型（DOM）',
three: '浏览器对象模型（BOM）'
},
describe: '没什么产品是写不了的',
a: 1,
b: 2
},
computed: {
sum() {
return this.a + this.b
}
},
mounted() {
console.log('i am mounted', this.a)
}
})
</script>
</body>
</html>