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vue3.html
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vue3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>vue2</title>
</head>
<body>
<div id="app">
<p>{{counter}}</p>
<p k-text="counter"></p>
<p k-html="desc"></p>
</div>
<script>
// vue.util.defineReactive(obj, key, val)
function defineReactive(obj, key, val) {
observe(val)
Object.defineProperty(obj, key, {
get() {
// console.log('get', key, val)
return val
},
set(v) {
// console.log('set', v)
observe(v)
val = v
update()
}
})
}
function observe(val) {
if(typeof val !== 'object' || val === null || val === undefined){
return
}
Object.keys(val).forEach(key => {
defineReactive(val, key, val[key])
})
}
function proxy(vm){
Object.keys(vm.$data).forEach(key => {
Object.defineProperty(vm, key, {
get() {
return vm.$data[key]
},
set(v) {
vm.$data[key] = v
}
})
})
}
class Vue{
constructor(options) {
this.$options = options
this.$data = options.data
observe(this.$data)
proxy(this)
new Compile(options.el, this)
}
}
class Compile{
constructor(el, vm) {
this.$vm = vm
const dom = document.querySelector(el)
this.compile(dom)
}
compile(el){
const childNodes = el.childNodes
childNodes.forEach(node => {
if(this.isElement(node)){
console.log('编译元素：', node.nodeName)
const attrs = node.attributes
Array.from(attrs).forEach(attr => {
const attrName = attr.name
const exp = attr.value
if(this.isDir(attrName)){
const dir = attrName.substring(2)
// 看看是否是合法的指令
this[dir] && this[dir](node, exp)
}
})
if(node.childNodes.length > 0){
this.compile(node)
}
} else if(this.isInterpolation(node)) {
this.compileText(node)
}
})
}
update(node, exp, dir) {
const fn = this[dir + 'Updater']
fn && fn(node, this.$vm[exp])
new Watcher(this.$vm, exp, function(val){
fn && fn(node, val)
})
}
text(node, exp) {
this.update(node, exp, 'text')
}
textUpdater(node, val){
node.textContent = val
}
html(node, exp) {
this.update(node, exp, 'html')
}
htmlUpdater(node, val) {
node.innerHTML = val
}
compileText(node){
this.update(node, RegExp.$1, 'text')
}
isElement(node){
return node.nodeType === 1
}
isInterpolation(node) {
return node.nodeType === 3 && /\{\{(.*)\}\}/.test(node.textContent)
}
isDir(attrName) {
return attrName.startsWith('k-')
}
}
class Watcher{
constructor(vm, key, updater) {
this.vm = vm
this.key = key
this.updater = updater
}
update() {
const val = this.vm[this.key]
this.updater.call(this.vm, val)
}
}
class Dep{
}
function set(obj, key, val){
defineReactive(obj, key, val)
}
function update() {
app.innerHTML = app.counter
}
</script>
<script>
const app = new Vue({
el:'#app',
data: {
counter: 1,
desc: '<span style="color: red;">coboy</span>'
},
})
setInterval(() => {
app.counter++
}, 1000);
</script>
</body>
</html>