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responsive2.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>Document</title>
</head>
<body>
</body>
<script>
const data = [1, 2]
const obj = {}
const bucket = new WeakMap()
let activeEffect
const effectStack = []
const ITERATOR_KEY = Symbol()
const MAP_KEY_ITERATOR_KEY = Symbol()
const reactiveMap = new Map()
const ref = (val) => {
const wrapper = {value: val}
Object.defineProperty(wrapper, '_v_isRef', {
value: true
})
return reactive(wrapper)
}
const mutableInstrumentations = { // 自定义函数
add (key) { // 代理set
const target = this.raw
const hadKey = target.has(key)
if (!hadKey) {
const res = target.add(key)
trigger(target, key, 'ADD')
}
return res
},
delete (key) { // 代理set
const target = this.raw
const hadKey = target.has(key)
if (hadKey) {
const res = target.delete(key)
trigger(target, key, 'DELETE')
}
return res
},
get (key) { // 代理map
const target = this.raw
const had = target.has(key)
track(target, key)
if (had) {
const res = target.get(key)
return typeof res === 'object' ? reactive(res) : res
}
},
set (key, value) { // 代理map
const target = this.raw
const had = target.has(key)
const oldValue = target.get(key)
const rawValue = value.raw || value
target.set(key, rawValue)
if (!had) {
trigger(target, key, 'ADD')
} else if (oldValue !== value || (oldValue === oldValue && value === value)) {
trigger(target, key, 'SET')
}
},
forEach (cb) {
const wrap = (val) => {
return typeof val === 'object' ? reactive(val) : val
}
const target = this.raw
track(target, ITERATOR_KEY)
target.forEach((v, k) => {
cb(wrap(v), wrap(k))
})
},
[Symbol.iterator] () {
const target = this.raw
const iterator = target[Symbol.iterator]()
const wrap = (val) => {
return typeof val === 'object' && val !== null ? reactive(val) : val
}
track(target, ITERATOR_KEY)
return { // 返回自定义迭代器
next () {
const {value, done} = iterator.next()
return {
value: value ? [wrap[value[0]], wrap[value[1]]] : value,
done
}
},
[Symbol.iterator] () {
return this
}
}
},
values () {
const target = this.raw
const iterator = target.values()
const wrap = (val) => {
return typeof val === 'object' && val !== null ? reactive(val) : val
}
track(target, ITERATOR_KEY)
return { // 返回自定义迭代器
next () {
const {value, done} = iterator.next()
return {
value: wrap(value),
done
}
},
[Symbol.iterator] () {
return this
}
}
},
keys () {
const target = this.raw
const iterator = target.keys()
const wrap = (val) => {
return typeof val === 'object' && val !== null ? reactive(val) : val
}
track(target, MAP_KEY_ITERATOR_KEY)
return { // 返回自定义迭代器
next () {
const {value, done} = iterator.next()
return {
value: wrap(value),
done
}
},
[Symbol.iterator] () {
return this
}
}
}
}
const createReactive = (obj, isShallow = false, isReadonly = false) => {
return new Proxy(obj, {
get (target, key, receiver) {
if (key === 'raw') {
return target
}
// if (key === 'size') {
// track(target, ITERATOR_KEY)
// return Reflect.get(target, key, target)
// }
// return mutableInstrumentations[key]
track(target, key)
return Reflect.get(...arguments)
},
set (target, key, val, receiver) {
if (isReadonly) {
console.log(`属性${key}是只读的`);
return true
}
const oldValue = target[key]
const type = Array.isArray(target) ? Number(key) < target.length ? 'SET' : 'ADD' : Object.prototype.hasOwnProperty.call(target, key) ? 'SET' : 'ADD'
const res = Reflect.set(...arguments)
console.log(type, 'type');
if (target === receiver.raw) {// 判断receiver是否是target的代理对象,是则执行副作用函数,不是则不执行
if (oldValue !== val && (oldValue === oldValue || val === val)) { // 当旧值不等于新值时，才触发trigger函数
trigger(target, key, type, val)
}
}
return res
}
})
}
function track (target, key) {
if (!activeEffect) return;
let depsMap = bucket.get(target)
if (!depsMap) bucket.set(target, (depsMap = new Map()));
let deps = depsMap.get(key)
if (!deps) depsMap.set(key, (deps = new Set()));
deps.add(activeEffect)
activeEffect.deps.push(deps)
}
const trigger = (target, key, type, newVal) => {
console.log('set函数执行');
const depsMap = bucket.get(target)
if (!depsMap) return;
const deps = depsMap.get(key)
const effectDeps = new Set()
deps && deps.forEach(item => {
if (item !== activeEffect) {
effectDeps.add(item)
}
})
if (type === 'ADD' || type === 'DELETE' || (type === 'SET' && Object.prototype.toString.call(target) === '[object Map]')) { // target: 对象
// 取得与ITERATOR_KEY相关联的副作用函数
const iteratorEffect = depsMap.get(ITERATOR_KEY)
// 将与ITERATOR_KEY相关联的副作用函数添加到effectDeps中
iteratorEffect && iteratorEffect.forEach(iterator => {
if (iterator !== activeEffect) {
effectDeps.add(iterator)
}
})
}
if ((type === 'ADD' || type === 'DELETE') && Object.prototype.toString.call(target) === '[object Map]') {
const iteratorEffect = depsMap.get(MAP_KEY_ITERATOR_KEY)
// 将与ITERATOR_KEY相关联的副作用函数添加到effectDeps中
iteratorEffect && iteratorEffect.forEach(iterator => {
if (iterator !== activeEffect) {
effectDeps.add(iterator)
}
})
}
effectDeps.forEach(fn => {
if (fn.options.scheduler) {
fn.options.scheduler(fn) // 执行调度器函数，并传递副作用函数作为参数
} else {
fn()
}
})
}
const effect = (fn, options = {}) => {
const effectFn = () => {
cleanup(effectFn)
activeEffect = effectFn
effectStack.push(effectFn)
const res = fn()
effectStack.pop()
activeEffect = effectStack.at(-1)
return res
}
effectFn.options = options
effectFn.deps = []
if (!options.lazy) {
effectFn()
}
return effectFn
}
const cleanup = (effectFn) => {
for (let i = 0; i < effectFn.deps.length; i++) {
const dep = effectFn.deps[i];
dep.delete(effectFn)
}
effectFn.deps.length = 0
}
const reactive = (obj) => {
const existProxy = reactiveMap.get(obj)
if (existProxy) {
return existProxy
}
const proxy = createReactive(obj)
reactiveMap.set(obj, proxy)
return proxy
}
const p = reactive({foo: 1, bar: 2})
// const refVal = ref(2) // 创建原始值的响应式数据
const newObj = {
foo: {
get value() {
return p.foo
}
},
bar: {
get value() {
return p.bar
}
}
}
effect(() => {
console.log(newObj.foo.value);
})
p.foo = 100
</script>
</html>