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defineProperty.html
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defineProperty.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>mvvm实现</title>
</head>
<style>
.box {
width: 100px;
height: 100px;
border: 2px solid greenyellow;
}
</style>
<body>
<div id="app">
{{child.name}}
<div class="box" >{{userInfo.name}}</div>
<div>{{name}}</div>
</div>
<input type="text" />
<script>
/*
mvvm的简单实现，还没有完全实现
*/
function Mvvm(options = {}) {
const { data, el } = options;
this.$data = data;
for(let key in this.$data) {
Object.defineProperty(this, key, {
configurable: true,
get() {
return this.$data[key];
},
set(newVal) {
this.$data[key] = newVal;
}
});
}
observe(data);
new Compile(el, this);
}
function observe(data) {
if(!data || typeof data !== 'object') return;
new Observe(data);
}
function Observe(data) {
let dep = new Dep();
for(let key in data) {
let val = data[key];
observe(val);
Object.defineProperty(data, key, {
configurable: true,
get() {
Dep.target && dep.addSub(Dep.target);
return val;
},
set(newVal) {
console.log(newVal, 'setter');
if(val === newVal) return;
val = newVal;
observe(newVal);
dep.notify();
}
});
}
}
function Compile(el, vm) {
vm.$el = document.querySelector(el);
replace(vm.$el);
function replace(arr) {
Array.from(arr.childNodes).forEach(node => {
const reg = /\{\{(.*?)\}\}/g;
let txt = node.textContent;
if(node.nodeType === 3 && reg.test(node.textContent)) {
let REG_S = RegExp.$1.split('.');
let val = vm;
REG_S.forEach(key => {
val = val[key] || node.textContent;
});
if(val != txt) node.textContent = txt.replace(reg, val).trim();
new Watcher(vm, RegExp.$1, (newVal) => {
if(newVal != node.textContent) {
console.log(RegExp.$1);
node.textContent = txt.replace(reg, newVal).trim();
}
});
}
if(node.childNodes && node.childNodes.length > 0) {
replace(node);
}
});
}
}
function Dep() {
this.subs = [];
}
Dep.prototype = {
addSub(sub) {
this.subs.push(sub);
},
notify() {
this.subs.forEach(sub => sub.update());
}
}
function Watcher(vm, exp, fn) {
this.fn = fn;
this.vm = vm;
this.exp = exp;
Dep.target = this;
let arr = exp.split('.');
let val = vm;
arr.forEach(key => {
val = val[key];
});
Dep.target = null;
}
Watcher.prototype.update = function(newVal) {
let arr = this.exp.split('.');
let val = this.vm;
arr.forEach(key => {
val = val[key];
});
this.fn(val);
}
const Vue = new Mvvm({
el: '#app',
data: {
list: [],
name: 'jack',
age: 20,
child: {
name: 'jacks son'
},
userInfo: {
name: 'rose'
}
}
});
Vue.$data.name = 'tom';
document.querySelector('input[type=text]').addEventListener('input', (e) => {
Vue.$data.name = e.target.value;
console.log(Vue);
});
Vue.list = {
name: 'jack',
child: {
name: 'tom'
}
}
console.log(Vue);
</script>
</body>
</html>