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proxyMvvm.html
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proxyMvvm.html
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<!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>proxy</title>
</head>
<div id="app">
<div>{{ name }}</div>
<div>{{ child.name }}</div>
<div>{{ num }}</div>
<div>{{ getName }}</div>
<input class="inp" type="text" v-model="num" @click="taps" />
<!-- <input class="inp" type="text" v-model="count" /> -->
</div>
<script>
class Mvvm {
constructor(options) {
let { data, el, methods } = options;
this.$options = options;
this.$el = document.querySelector(el);
this.$data = data;
this.$methods = methods;
let vm = initVm.call(this);
initObserve.call(this, this.$data);
initComputed.call(this);
new Compile(el, vm);
return this.$vm;
// this.$vm === vm
}
}
function initComputed() {
let computed = this.$options.computed;
this.$computed = {};
if(!computed) return;
Object.keys(computed).forEach(key => {
this.$computed[key] = computed[key].call(this.$vm);
new Watcher(this.$vm, key, val => {
this.$computed[key] = computed[key].call(this.$vm);
});
});
}
function initVm() {
/*
这一步主要是代理数据 当我访问vm.xx的时候先从vm找有没有xx如果没有就从vm.$data里寻找
就相当于将vm.$data上的数据代理到vm上 访问vm.name === 访问 vm.$data.name
*/
this.$vm = new Proxy(this, {
get: (target, property, receiver) => {
return this[property] || this.$data[property] || this.$computed[property] || this.$methods[property];
},
set:(target, property, value, receiver) => {
return Reflect.set(this.$data, property, value);
}
});
return this.$vm;
}
function initObserve(data) {
this.$data = observe(data);
}
function observe(data) {
if(typeof data !== 'object') return data;
return new Observe(data);
}
class Observe {
/*
实现观察者，递归监听data里的数据
*/
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, property, receiver) {
if(Dep.target) {
if(!dep.subs.includes(Dep.exp)) {
dep.addSub(Dep.exp);
dep.addSub(Dep.target);
}
}
return Reflect.get(target, property);
},
set(target, property, value, receiver) {
const result = Reflect.set(target, property, observe(value));
dep.notify();
return result;
}
});
}
}
class Compile {
/*
编译数据
将data的数据渲染到页面上
*/
constructor(el, vm) {
this.vm = vm;
let fragment = document.createDocumentFragment();
fragment.append(document.querySelector(el));
this.replace(fragment);
document.body.appendChild(fragment);
}
replace(arr) {
Array.from(arr.childNodes).forEach(node => {
const reg = /\{\{(.*?)\}\}/g;
let txt = node.textContent;
if(node.nodeType === 1) {
this.directives(node);
}
if(node.nodeType === 3 && reg.test(node.textContent)) {
let vm = this.vm;
updateTxt();
function updateTxt() {
const val = txt.replace(reg, (matched, arrs) => {
new Watcher(vm, arrs, updateTxt);
return arrs.split('.').map(el => el.trim()).reduce((obj, key) => {
return obj[key] === undefined? node.textContent : obj[key]; // 例如：去vm.makeUp.one对象拿到值
}, vm);
});
if(val != node.textContent) {
node.textContent = val;
}
}
}
if(node.childNodes && node.childNodes.length > 0) {
this.replace(node);
}
});
}
directives(node) {
const vm = this.vm;
Array.prototype.slice.call(node.attributes).forEach(el => {
if(el.name.includes('@')) {
const eventName = el.name.split('@')[1];
node.setAttribute(`v-bind:${ eventName }`, el.value);
node.addEventListener(eventName, vm.$methods[el.value].bind(vm));
}
if(el.name === 'v-model') {
node.value = vm[el.value];
node.addEventListener('input', e => {
vm[el.value] = e.target.value;
});
}
});
}
}
class Dep {
/*
发布订阅
监听setter 当触发setter会调用注册过的函数 依次调用函数
*/
constructor() {
this.subs = [];
}
addSub(sub) {
this.subs.push(sub);
}
notify() {
this.subs.filter(fn => typeof fn !== '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;
const arr = exp.split('.').map(el => el.trim());
let val = vm;
arr.forEach(key => {
val = val[key] || val;
});
Dep.target = null;
}
update() {
const arr = this.exp.split('.').map(el => el.trim());
let val = this.vm;
arr.forEach(key => {
val = val[key];
});
this.fn(val);
}
}
const Vue = new Mvvm({
el: '#app',
data: {
name: 'jack',
num: 10,
child: {
name: 'tom'
},
list: []
},
computed: {
getName() {
return this.num *10;
}
},
methods: {
taps(e) {
console.log(e.target.value);
}
}
});
Vue.list = {
name: 'koko'
}
console.log(Vue.getName);
</script>
</body>
</html>