第18集Vue3原理深度解析

// Vue3架构概览
class Vue3Architecture {
    constructor() {
        this.modules = {
            // 响应式系统
            reactivity: '基于Proxy的响应式系统',
            
            // 运行时核心
            runtimeCore: '虚拟DOM和渲染器',
            
            // 编译器
            compiler: '模板编译和优化',
            
            // 组合式API
            compositionAPI: 'Composition API实现',
            
            // 工具函数
            utils: '工具函数和类型定义'
        };
    }
    
    explainArchitecture() {
        console.log('Vue3架构特点：');
        console.log('1. 模块化设计：各模块独立，可按需引入');
        console.log('2. Tree-shaking友好：未使用的代码会被自动移除');
        console.log('3. TypeScript支持：完整的类型定义');
        console.log('4. 性能优化：更快的渲染和更小的包体积');
    }
}

// 模块化引入示例
import { reactive, ref, computed } from '@vue/reactivity';
import { createApp } from '@vue/runtime-core';
import { compile } from '@vue/compiler-core';

// Vue3设计理念
class Vue3DesignPrinciples {
    constructor() {
        this.principles = {
            // 更好的TypeScript支持
            typescript: {
                description: '完整的TypeScript支持',
                benefits: ['类型安全', '更好的IDE支持', '重构友好']
            },
            
            // 更好的Tree-shaking
            treeShaking: {
                description: '按需引入，减少包体积',
                benefits: ['更小的包体积', '更快的加载速度', '更好的缓存']
            },
            
            // 更好的性能
            performance: {
                description: '更快的渲染和更新',
                benefits: ['更快的虚拟DOM', '更智能的更新策略', '更好的内存管理']
            },
            
            // 更好的开发体验
            developerExperience: {
                description: '更好的开发工具和调试体验',
                benefits: ['更好的调试工具', '更清晰的错误信息', '更好的热重载']
            }
        };
    }
    
    explainPrinciples() {
        Object.keys(this.principles).forEach(key => {
            const principle = this.principles[key];
            console.log(`${key}: ${principle.description}`);
            console.log('优势:', principle.benefits.join(', '));
        });
    }
}

// Vue3响应式系统实现
class Vue3ReactiveSystem {
    constructor() {
        this.targetMap = new WeakMap();
        this.activeEffect = null;
        this.effectStack = [];
    }
    
    // 创建响应式对象
    reactive(target) {
        if (this.isReactive(target)) {
            return target;
        }
        
        return new Proxy(target, {
            get(target, key, receiver) {
                // 收集依赖
                this.track(target, key);
                
                const res = Reflect.get(target, key, receiver);
                
                // 如果是对象，递归创建响应式
                if (this.isObject(res)) {
                    return this.reactive(res);
                }
                
                return res;
            },
            
            set(target, key, value, receiver) {
                const oldValue = target[key];
                const result = Reflect.set(target, key, value, receiver);
                
                // 触发更新
                if (oldValue !== value) {
                    this.trigger(target, key);
                }
                
                return result;
            },
            
            deleteProperty(target, key) {
                const hadKey = key in target;
                const result = Reflect.deleteProperty(target, key);
                
                if (hadKey) {
                    this.trigger(target, key);
                }
                
                return result;
            }
        });
    }
    
    // 创建ref
    ref(value) {
        return this.createRef(value, false);
    }
    
    // 创建shallowRef
    shallowRef(value) {
        return this.createRef(value, true);
    }
    
    // 创建ref的内部实现
    createRef(value, shallow) {
        const ref = {
            __v_isRef: true,
            __v_isShallow: shallow,
            _value: shallow ? value : this.toReactive(value),
            get value() {
                this.track(ref, 'value');
                return ref._value;
            },
            set value(newVal) {
                if (shallow) {
                    ref._value = newVal;
                } else {
                    ref._value = this.toReactive(newVal);
                }
                this.trigger(ref, 'value');
            }
        };
        
        return ref;
    }
    
    // 转换为响应式
    toReactive(value) {
        if (this.isObject(value)) {
            return this.reactive(value);
        }
        return value;
    }
    
    // 收集依赖
    track(target, key) {
        if (this.activeEffect) {
            let depsMap = this.targetMap.get(target);
            if (!depsMap) {
                this.targetMap.set(target, (depsMap = new Map()));
            }
            
            let dep = depsMap.get(key);
            if (!dep) {
                depsMap.set(key, (dep = new Set()));
            }
            
            dep.add(this.activeEffect);
        }
    }
    
    // 触发更新
    trigger(target, key) {
        const depsMap = this.targetMap.get(target);
        if (!depsMap) return;
        
        const dep = depsMap.get(key);
        if (dep) {
            dep.forEach(effect => {
                if (effect !== this.activeEffect) {
                    effect.run();
                }
            });
        }
    }
    
    // 创建effect
    effect(fn, options = {}) {
        const effect = new ReactiveEffect(fn, options);
        
        if (!options.lazy) {
            effect.run();
        }
        
        return effect;
    }
    
    // 判断是否为响应式对象
    isReactive(value) {
        return !!(value && value.__v_isReactive);
    }
    
    // 判断是否为对象
    isObject(value) {
        return value !== null && typeof value === 'object';
    }
}

// ReactiveEffect类
class ReactiveEffect {
    constructor(fn, options = {}) {
        this.fn = fn;
        this.options = options;
        this.deps = [];
        this.active = true;
    }
    
    run() {
        if (!this.active) {
            return this.fn();
        }
        
        // 设置当前活跃的effect
        const activeEffect = reactiveSystem.activeEffect;
        reactiveSystem.activeEffect = this;
        
        try {
            return this.fn();
        } finally {
            reactiveSystem.activeEffect = activeEffect;
        }
    }
    
    stop() {
        if (this.active) {
            this.active = false;
            this.deps.forEach(dep => dep.delete(this));
            this.deps.length = 0;
        }
    }
}

// 使用响应式系统
const reactiveSystem = new Vue3ReactiveSystem();

// 创建响应式对象
const state = reactiveSystem.reactive({
    count: 0,
    user: {
        name: '张三',
        age: 25
    }
});

// 创建effect
const effect = reactiveSystem.effect(() => {
    console.log('count:', state.count);
    console.log('user name:', state.user.name);
});

// 修改数据
state.count++; // 触发更新
state.user.name = '李四'; // 触发更新

// 计算属性实现
class ComputedRef {
    constructor(getter, setter) {
        this._dirty = true;
        this._value = undefined;
        this._getter = getter;
        this._setter = setter;
        this._effect = null;
        
        this._effect = reactiveSystem.effect(() => {
            if (this._dirty) {
                this._value = this._getter();
                this._dirty = false;
            }
        }, { lazy: true });
    }
    
    get value() {
        if (this._dirty) {
            this._value = this._getter();
            this._dirty = false;
        }
        
        // 收集依赖
        reactiveSystem.track(this, 'value');
        
        return this._value;
    }
    
    set value(newValue) {
        if (this._setter) {
            this._setter(newValue);
            this._dirty = true;
        }
    }
}

// 创建计算属性
function computed(getterOrOptions) {
    let getter, setter;
    
    if (typeof getterOrOptions === 'function') {
        getter = getterOrOptions;
        setter = () => {
            console.warn('Write operation failed: computed value is readonly');
        };
    } else {
        getter = getterOrOptions.get;
        setter = getterOrOptions.set;
    }
    
    return new ComputedRef(getter, setter);
}

// 使用计算属性
const state = reactiveSystem.reactive({
    firstName: '张',
    lastName: '三'
});

const fullName = computed(() => {
    return state.firstName + state.lastName;
});

console.log(fullName.value); // 张三

state.firstName = '李';
console.log(fullName.value); // 李三

// Composition API核心实现
class CompositionAPI {
    constructor() {
        this.currentInstance = null;
        this.setupState = null;
        this.setupContext = null;
    }
    
    // 设置当前实例
    setCurrentInstance(instance) {
        this.currentInstance = instance;
    }
    
    // 获取当前实例
    getCurrentInstance() {
        return this.currentInstance;
    }
    
    // 执行setup函数
    executeSetup(instance, setup, props, ctx) {
        this.setCurrentInstance(instance);
        
        try {
            // 设置setup上下文
            this.setupContext = ctx;
            
            // 执行setup函数
            const setupResult = setup(props, ctx);
            
            // 处理setup返回值
            if (typeof setupResult === 'function') {
                // 如果返回函数，作为render函数
                instance.render = setupResult;
            } else if (typeof setupResult === 'object') {
                // 如果返回对象，作为setupState
                instance.setupState = setupResult;
            }
            
            return setupResult;
        } finally {
            this.setCurrentInstance(null);
        }
    }
    
    // 创建组件实例
    createComponentInstance(vnode, parent) {
        const instance = {
            vnode,
            parent,
            setupState: {},
            render: null,
            props: vnode.props,
            ctx: this.createSetupContext(instance)
        };
        
        return instance;
    }
    
    // 创建setup上下文
    createSetupContext(instance) {
        return {
            attrs: instance.attrs,
            slots: instance.slots,
            emit: instance.emit,
            expose: (exposed) => {
                instance.exposed = exposed;
            }
        };
    }
}

// 使用Composition API
const compositionAPI = new CompositionAPI();

// 组件定义
const MyComponent = {
    props: ['title'],
    setup(props, { emit, expose }) {
        const count = reactiveSystem.ref(0);
        const doubleCount = computed(() => count.value * 2);
        
        const increment = () => {
            count.value++;
            emit('update:count', count.value);
        };
        
        // 暴露给父组件的方法
        expose({
            increment,
            reset: () => count.value = 0
        });
        
        return {
            count,
            doubleCount,
            increment
        };
    },
    template: `
        <div>
            <h2>{{ title }}</h2>
            <p>Count: {{ count }}</p>
            <p>Double: {{ doubleCount }}</p>
            <button @click="increment">Increment</button>
        </div>
    `
};

// 生命周期钩子实现
class LifecycleHooks {
    constructor() {
        this.hooks = {
            beforeCreate: [],
            created: [],
            beforeMount: [],
            mounted: [],
            beforeUpdate: [],
            updated: [],
            beforeUnmount: [],
            unmounted: []
        };
    }
    
    // 注册生命周期钩子
    registerHook(hook, fn) {
        if (!this.hooks[hook]) {
            this.hooks[hook] = [];
        }
        this.hooks[hook].push(fn);
    }
    
    // 执行生命周期钩子
    callHook(hook, instance) {
        const hooks = this.hooks[hook];
        if (hooks) {
            hooks.forEach(fn => {
                try {
                    fn.call(instance);
                } catch (error) {
                    console.error(`Error in ${hook} hook:`, error);
                }
            });
        }
    }
    
    // 在setup中注册生命周期钩子
    onBeforeMount(fn) {
        this.registerHook('beforeMount', fn);
    }
    
    onMounted(fn) {
        this.registerHook('mounted', fn);
    }
    
    onBeforeUpdate(fn) {
        this.registerHook('beforeUpdate', fn);
    }
    
    onUpdated(fn) {
        this.registerHook('updated', fn);
    }
    
    onBeforeUnmount(fn) {
        this.registerHook('beforeUnmount', fn);
    }
    
    onUnmounted(fn) {
        this.registerHook('unmounted', fn);
    }
}

// 使用生命周期钩子
const lifecycleHooks = new LifecycleHooks();

const MyComponent = {
    setup() {
        const data = reactiveSystem.ref(null);
        
        // 注册生命周期钩子
        lifecycleHooks.onMounted(() => {
            console.log('组件已挂载');
            // 获取数据
            fetchData().then(result => {
                data.value = result;
            });
        });
        
        lifecycleHooks.onUnmounted(() => {
            console.log('组件即将卸载');
            // 清理资源
            cleanup();
        });
        
        return {
            data
        };
    }
};

// 虚拟DOM节点
class VNode {
    constructor(type, props, children, key) {
        this.type = type;
        this.props = props || {};
        this.children = children;
        this.key = key;
        this.el = null; // 对应的DOM元素
        this.component = null; // 组件实例
    }
    
    // 创建虚拟DOM节点
    static createElement(type, props, children) {
        return new VNode(type, props, children, props?.key);
    }
    
    // 创建文本节点
    static createText(text) {
        return new VNode(null, null, text);
    }
    
    // 创建注释节点
    static createComment(text) {
        return new VNode(null, null, text, null, true);
    }
}

// 渲染器
class Renderer {
    constructor(options) {
        this.options = options;
        this.createElement = options.createElement;
        this.insert = options.insert;
        this.remove = options.remove;
        this.setElementText = options.setElementText;
        this.patchProps = options.patchProps;
    }
    
    // 渲染虚拟DOM
    render(vnode, container) {
        if (vnode) {
            this.patch(container._vnode, vnode, container);
        } else {
            if (container._vnode) {
                this.unmount(container._vnode);
            }
        }
        container._vnode = vnode;
    }
    
    // 打补丁
    patch(n1, n2, container, anchor = null) {
        if (n1 && n1.type !== n2.type) {
            this.unmount(n1);
            n1 = null;
        }
        
        const { type } = n2;
        
        if (typeof type === 'string') {
            // 元素节点
            if (!n1) {
                this.mountElement(n2, container, anchor);
            } else {
                this.patchElement(n1, n2);
            }
        } else if (typeof type === 'object') {
            // 组件节点
            if (!n1) {
                this.mountComponent(n2, container, anchor);
            } else {
                this.patchComponent(n1, n2);
            }
        } else if (type === null) {
            // 文本节点
            if (!n1) {
                this.mountText(n2, container, anchor);
            } else {
                this.patchText(n1, n2);
            }
        }
    }
    
    // 挂载元素
    mountElement(vnode, container, anchor) {
        const el = this.createElement(vnode.type);
        vnode.el = el;
        
        // 处理props
        if (vnode.props) {
            this.patchProps(el, null, vnode.props);
        }
        
        // 处理children
        if (vnode.children) {
            if (typeof vnode.children === 'string') {
                this.setElementText(el, vnode.children);
            } else {
                vnode.children.forEach(child => {
                    this.patch(null, child, el);
                });
            }
        }
        
        this.insert(el, container, anchor);
    }
    
    // 挂载组件
    mountComponent(vnode, container, anchor) {
        const instance = vnode.component = this.createComponentInstance(vnode);
        
        // 设置组件实例
        this.setupComponent(instance);
        
        // 设置渲染effect
        this.setupRenderEffect(instance, container, anchor);
    }
    
    // 创建组件实例
    createComponentInstance(vnode) {
        const instance = {
            vnode,
            type: vnode.type,
            setupState: {},
            render: null,
            props: vnode.props,
            ctx: {}
        };
        
        return instance;
    }
    
    // 设置组件
    setupComponent(instance) {
        const { setup } = instance.type;
        
        if (setup) {
            const setupResult = setup(instance.props, instance.ctx);
            
            if (typeof setupResult === 'function') {
                instance.render = setupResult;
            } else if (typeof setupResult === 'object') {
                instance.setupState = setupResult;
            }
        }
        
        if (!instance.render) {
            instance.render = instance.type.render;
        }
    }
    
    // 设置渲染effect
    setupRenderEffect(instance, container, anchor) {
        const componentUpdateFn = () => {
            if (!instance.isMounted) {
                // 首次渲染
                const subTree = instance.render.call(instance.ctx);
                this.patch(null, subTree, container, anchor);
                instance.isMounted = true;
            } else {
                // 更新渲染
                const nextTree = instance.render.call(instance.ctx);
                const prevTree = instance.subTree;
                instance.subTree = nextTree;
                this.patch(prevTree, nextTree, container, anchor);
            }
        };
        
        // 创建effect
        const effect = reactiveSystem.effect(componentUpdateFn);
        instance.update = effect;
    }
    
    // 卸载
    unmount(vnode) {
        if (vnode.type === null) {
            // 文本节点
            this.remove(vnode.el);
        } else if (typeof vnode.type === 'string') {
            // 元素节点
            this.remove(vnode.el);
        } else if (typeof vnode.type === 'object') {
            // 组件节点
            this.unmountComponent(vnode);
        }
    }
    
    // 卸载组件
    unmountComponent(vnode) {
        const instance = vnode.component;
        
        // 调用生命周期钩子
        if (instance.beforeUnmount) {
            instance.beforeUnmount();
        }
        
        // 停止effect
        if (instance.update) {
            instance.update.stop();
        }
        
        // 卸载子节点
        if (instance.subTree) {
            this.unmount(instance.subTree);
        }
        
        // 调用生命周期钩子
        if (instance.unmounted) {
            instance.unmounted();
        }
    }
}

// 创建渲染器
function createRenderer(options) {
    return new Renderer(options);
}

// 浏览器渲染器
const renderer = createRenderer({
    createElement(tag) {
        return document.createElement(tag);
    },
    
    insert(el, parent, anchor) {
        parent.insertBefore(el, anchor);
    },
    
    remove(el) {
        const parent = el.parentNode;
        if (parent) {
            parent.removeChild(el);
        }
    },
    
    setElementText(el, text) {
        el.textContent = text;
    },
    
    patchProps(el, key, nextProps) {
        if (key) {
            // 更新属性
            if (nextProps[key] !== undefined) {
                el.setAttribute(key, nextProps[key]);
            } else {
                el.removeAttribute(key);
            }
        } else {
            // 设置所有属性
            Object.keys(nextProps).forEach(key => {
                el.setAttribute(key, nextProps[key]);
            });
        }
    }
});

// 组件系统
class ComponentSystem {
    constructor() {
        this.components = new Map();
        this.globalComponents = new Map();
    }
    
    // 注册组件
    registerComponent(name, component) {
        this.components.set(name, component);
    }
    
    // 注册全局组件
    registerGlobalComponent(name, component) {
        this.globalComponents.set(name, component);
    }
    
    // 解析组件
    resolveComponent(name) {
        return this.components.get(name) || this.globalComponents.get(name);
    }
    
    // 创建组件实例
    createComponentInstance(component, props, children) {
        const instance = {
            type: component,
            props,
            children,
            setupState: {},
            render: null,
            ctx: {}
        };
        
        // 执行setup
        if (component.setup) {
            const setupResult = component.setup(props, instance.ctx);
            
            if (typeof setupResult === 'function') {
                instance.render = setupResult;
            } else if (typeof setupResult === 'object') {
                instance.setupState = setupResult;
            }
        }
        
        if (!instance.render) {
            instance.render = component.render;
        }
        
        return instance;
    }
}

// 使用组件系统
const componentSystem = new ComponentSystem();

// 注册组件
componentSystem.registerComponent('MyButton', {
    props: ['type', 'disabled'],
    setup(props) {
        const handleClick = () => {
            if (!props.disabled) {
                console.log('Button clicked');
            }
        };
        
        return {
            handleClick
        };
    },
    render() {
        return VNode.createElement('button', {
            class: `btn btn-${this.props.type}`,
            disabled: this.props.disabled,
            onClick: this.handleClick
        }, this.children);
    }
});

// 使用组件
const app = {
    render() {
        return VNode.createElement('div', null, [
            VNode.createElement('h1', null, 'My App'),
            VNode.createElement('MyButton', { type: 'primary' }, 'Click me')
        ]);
    }
};

// 编译时优化
class CompilerOptimizer {
    constructor() {
        this.optimizations = {
            // 静态提升
            staticHoisting: true,
            
            // 补丁标记
            patchFlag: true,
            
            // 树结构优化
            treeShaking: true,
            
            // 内联事件处理
            inlineHandlers: true
        };
    }
    
    // 静态提升优化
    staticHoisting(template) {
        // 将静态内容提升到渲染函数外部
        const staticNodes = [];
        const dynamicNodes = [];
        
        template.forEach(node => {
            if (this.isStaticNode(node)) {
                staticNodes.push(node);
            } else {
                dynamicNodes.push(node);
            }
        });
        
        return {
            staticNodes,
            dynamicNodes
        };
    }
    
    // 判断是否为静态节点
    isStaticNode(node) {
        if (node.type === 'text') {
            return true;
        }
        
        if (node.type === 'element') {
            // 检查属性是否都是静态的
            const hasDynamicProps = Object.keys(node.props).some(key => {
                const value = node.props[key];
                return typeof value === 'function' || 
                       (typeof value === 'string' && value.includes('{{'));
            });
            
            // 检查子节点是否都是静态的
            const hasDynamicChildren = node.children.some(child => 
                !this.isStaticNode(child)
            );
            
            return !hasDynamicProps && !hasDynamicChildren;
        }
        
        return false;
    }
    
    // 补丁标记优化
    patchFlagOptimization(node) {
        const flags = [];
        
        if (node.props) {
            Object.keys(node.props).forEach(key => {
                if (typeof node.props[key] === 'function') {
                    flags.push('PROPS');
                } else if (key === 'class') {
                    flags.push('CLASS');
                } else if (key === 'style') {
                    flags.push('STYLE');
                }
            });
        }
        
        if (node.children) {
            const hasDynamicChildren = node.children.some(child => 
                !this.isStaticNode(child)
            );
            
            if (hasDynamicChildren) {
                flags.push('CHILDREN');
            }
        }
        
        return flags;
    }
    
    // 内联事件处理优化
    inlineHandlersOptimization(node) {
        if (node.props) {
            Object.keys(node.props).forEach(key => {
                if (key.startsWith('on') && typeof node.props[key] === 'function') {
                    // 将事件处理函数内联
                    node.props[key] = this.inlineFunction(node.props[key]);
                }
            });
        }
    }
    
    // 内联函数
    inlineFunction(fn) {
        const fnString = fn.toString();
        return new Function('return ' + fnString)();
    }
}

// 使用编译时优化
const optimizer = new CompilerOptimizer();

const template = [
    {
        type: 'element',
        tag: 'div',
        props: { class: 'container' },
        children: [
            {
                type: 'text',
                content: 'Hello World'
            },
            {
                type: 'element',
                tag: 'button',
                props: { onClick: () => console.log('clicked') },
                children: [
                    {
                        type: 'text',
                        content: 'Click me'
                    }
                ]
            }
        ]
    }
];

// 应用优化
const optimized = optimizer.staticHoisting(template);
console.log('静态节点:', optimized.staticNodes);
console.log('动态节点:', optimized.dynamicNodes);

// 运行时优化
class RuntimeOptimizer {
    constructor() {
        this.optimizations = {
            // 快速路径
            fastPath: true,
            
            // 批量更新
            batchUpdate: true,
            
            // 异步更新
            asyncUpdate: true,
            
            // 内存优化
            memoryOptimization: true
        };
    }
    
    // 快速路径优化
    fastPathOptimization(vnode1, vnode2) {
        // 如果节点类型相同且没有动态内容，使用快速路径
        if (vnode1.type === vnode2.type && 
            this.isStaticVNode(vnode1) && 
            this.isStaticVNode(vnode2)) {
            return this.fastPathUpdate(vnode1, vnode2);
        }
        
        return this.normalUpdate(vnode1, vnode2);
    }
    
    // 快速路径更新
    fastPathUpdate(vnode1, vnode2) {
        // 直接更新DOM，跳过虚拟DOM比较
        if (vnode1.el && vnode2.el) {
            vnode2.el = vnode1.el;
        }
        
        return true;
    }
    
    // 正常更新
    normalUpdate(vnode1, vnode2) {
        // 执行完整的虚拟DOM比较
        return this.diff(vnode1, vnode2);
    }
    
    // 批量更新优化
    batchUpdateOptimization(updates) {
        const batchedUpdates = [];
        let isUpdating = false;
        
        const flushUpdates = () => {
            if (batchedUpdates.length > 0) {
                // 执行批量更新
                batchedUpdates.forEach(update => update());
                batchedUpdates.length = 0;
            }
            isUpdating = false;
        };
        
        const scheduleUpdate = (update) => {
            batchedUpdates.push(update);
            
            if (!isUpdating) {
                isUpdating = true;
                // 使用微任务批量执行更新
                Promise.resolve().then(flushUpdates);
            }
        };
        
        return scheduleUpdate;
    }
    
    // 异步更新优化
    asyncUpdateOptimization() {
        const updateQueue = [];
        let isFlushing = false;
        
        const flushUpdates = () => {
            if (isFlushing) return;
            
            isFlushing = true;
            
            // 按优先级排序更新
            updateQueue.sort((a, b) => b.priority - a.priority);
            
            // 执行更新
            updateQueue.forEach(update => {
                try {
                    update.fn();
                } catch (error) {
                    console.error('Update error:', error);
                }
            });
            
            updateQueue.length = 0;
            isFlushing = false;
        };
        
        const scheduleUpdate = (fn, priority = 0) => {
            updateQueue.push({ fn, priority });
            
            // 使用requestIdleCallback在空闲时执行更新
            if (typeof requestIdleCallback !== 'undefined') {
                requestIdleCallback(flushUpdates);
            } else {
                setTimeout(flushUpdates, 0);
            }
        };
        
        return scheduleUpdate;
    }
    
    // 内存优化
    memoryOptimization() {
        const objectPool = new Map();
        
        const getObject = (type) => {
            if (!objectPool.has(type)) {
                objectPool.set(type, []);
            }
            
            const pool = objectPool.get(type);
            return pool.pop() || this.createObject(type);
        };
        
        const releaseObject = (obj, type) => {
            if (!objectPool.has(type)) {
                objectPool.set(type, []);
            }
            
            const pool = objectPool.get(type);
            if (pool.length < 100) { // 限制池大小
                this.resetObject(obj);
                pool.push(obj);
            }
        };
        
        return { getObject, releaseObject };
    }
    
    // 创建对象
    createObject(type) {
        switch (type) {
            case 'vnode':
                return new VNode();
            case 'effect':
                return new ReactiveEffect();
            default:
                return {};
        }
    }
    
    // 重置对象
    resetObject(obj) {
        Object.keys(obj).forEach(key => {
            delete obj[key];
        });
    }
    
    // 判断是否为静态虚拟节点
    isStaticVNode(vnode) {
        return vnode.type === 'text' || 
               (vnode.type === 'element' && !vnode.props && !vnode.children);
    }
    
    // 虚拟DOM差异比较
    diff(vnode1, vnode2) {
        if (vnode1.type !== vnode2.type) {
            return false;
        }
        
        if (vnode1.props && vnode2.props) {
            const props1 = Object.keys(vnode1.props);
            const props2 = Object.keys(vnode2.props);
            
            if (props1.length !== props2.length) {
                return false;
            }
            
            for (let i = 0; i < props1.length; i++) {
                if (props1[i] !== props2[i] || 
                    vnode1.props[props1[i]] !== vnode2.props[props2[i]]) {
                    return false;
                }
            }
        }
        
        if (vnode1.children && vnode2.children) {
            if (vnode1.children.length !== vnode2.children.length) {
                return false;
            }
            
            for (let i = 0; i < vnode1.children.length; i++) {
                if (!this.diff(vnode1.children[i], vnode2.children[i])) {
                    return false;
                }
            }
        }
        
        return true;
    }
}

// 使用运行时优化
const runtimeOptimizer = new RuntimeOptimizer();

// 批量更新
const scheduleUpdate = runtimeOptimizer.batchUpdateOptimization([]);

// 异步更新
const asyncScheduleUpdate = runtimeOptimizer.asyncUpdateOptimization();

// 内存优化
const { getObject, releaseObject } = runtimeOptimizer.memoryOptimization();