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5.5.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>
<div id="root"></div>
<script>
const obj = {
bar: 1,
info: {
age: 31,
name: "qqq",
},
};
const bucket = new WeakMap();
let activeEffect = null;
const effectsStack = [];
const ITERATE_KEY = Symbol("iterate");
const TriggerType = {
ADD: "ADD",
SET: "SET",
DELETE: "DELETE",
};
function reactive() {
return createReactive(obj);
}
function shallowReactive() {
return createReactive(obj, true);
}
function createReactive(source, isShallow = false) {
return new Proxy(source, {
get(target, key, receiver) {
if (key === "raw") return target;
const res = Reflect.get(target, key, receiver);
track(target, key);
if (isShallow) {
return res;
} else {
if (typeof res == "object" && res !== null) {
return createReactive(res);
} else {
return res;
}
}
},
has(target, key) {
track(target, key);
return Reflect.has(target, key);
},
ownKeys(target) {
track(target, ITERATE_KEY);
return Reflect.ownKeys(target);
},
set(target, key, value, receiver) {
const oldValue = target[key];
const type = Object.prototype.hasOwnProperty.call(target, key)
? TriggerType.SET
: TriggerType.ADD;
Reflect.set(target, key, value, receiver);
if (target === receiver.raw) {
trigger(target, key, type);
}
},
deleteProperty(target, key) {
const hadKey = Object.prototype.hasOwnProperty.call(target, key);
const res = Reflect.deleteProperty(target, key);
if (hadKey && res) {
trigger(target, key, TriggerType.DELETE);
}
},
});
}
function track(target, key) {
if (!activeEffect) return true;
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);
}
function trigger(target, key, type) {
const depsMap = bucket.get(target);
if (!depsMap) return true;
const effects = depsMap.get(key);
const iterateEffects = depsMap.get(ITERATE_KEY);
const effectsToRuns = new Set();
effects &&
effects.forEach((effect) => {
if (effect !== activeEffect) effectsToRuns.add(effect);
});
if (type === TriggerType.ADD || type === TriggerType.DELETE) {
iterateEffects &&
iterateEffects.forEach((effect) => {
if (effect !== activeEffect) effectsToRuns.add(effect);
});
}
effectsToRuns.forEach((effect) => {
if (effect.options.shedule) {
effect.options.shedule(effect);
} else {
effect();
}
});
}
function clearnUp(effectFn) {
effectFn.deps.forEach((deps) => {
deps.delete(effectFn);
});
effectFn.deps.length = 0;
}
function effect(fn, options = {}) {
let effectFn = () => {
clearnUp(effectFn);
activeEffect = effectFn;
effectsStack.push(activeEffect);
const res = fn();
effectsStack.pop();
activeEffect = effectsStack[effectsStack.length - 1];
return res;
};
effectFn.deps = [];
effectFn.options = options;
if (!options.lazy) {
return effectFn();
}
return effectFn;
}
function computed(getter) {
let dirtied = true;
let value = null;
const effectFn = effect(getter, {
lazy: true,
shedule: () => {
if (!dirtied) {
dirtied = true;
trigger(obj, "value");
}
},
});
const obj = {
get value() {
if (dirtied) {
value = effectFn();
dirtied = false;
}
track(obj, "value");
return value;
},
};
return obj;
}
function traverse(value, seen = new Set()) {
if (typeof value !== "object" || value === null || seen.has(value))
return value;
seen.add(value);
for (const key in value) {
traverse(value[key], seen);
}
return value;
}
function watch(source, callback, options) {
let getter;
let oldValue;
let cleanup;
function onInvalidate(fn) {
cleanup = fn;
}
if (typeof source === "function") {
getter = source;
} else {
getter = () => traverse(source);
}
function job() {
if (cleanup) {
cleanup();
}
const newValue = effectFn();
callback(newValue, oldValue, onInvalidate);
oldValue = newValue;
}
const effectFn = effect(() => getter(), {
lazy: true,
shedule: () => {
if (options.flush === "post") {
Promise.resolve().then(job);
} else {
job();
}
},
});
if (options.immediate) {
job(effectFn);
} else {
oldValue = effectFn();
}
}
const state = reactive(obj);
effect(() => {
root.innerHTML = "bar: " + state.bar + ", age: " + state.info.age;
});
setTimeout(() => {
// state.bar = 18;
}, 2000);
</script>
</body>
</html>