--- /dev/null
+<script src="../dist/vue.global.js"></script>
+<link rel="stylesheet" href="https://unpkg.com/todomvc-app-css/index.css">
+
+<div id="app">
+ <section class="todoapp">
+ <header class="header">
+ <h1>todos</h1>
+ <input class="new-todo"
+ autofocus autocomplete="off"
+ placeholder="What needs to be done?"
+ v-model="newTodo"
+ @keyup.enter="addTodo">
+ </header>
+ <section class="main" v-if="todos.length">
+ <input id="toggle-all" class="toggle-all" type="checkbox" v-model="allDone">
+ <label for="toggle-all">Mark all as complete</label>
+ <ul class="todo-list">
+ <li v-for="todo in filteredTodos"
+ class="todo"
+ :key="todo.id"
+ :class="{ completed: todo.completed, editing: todo === editedTodo }">
+ <div class="view">
+ <input class="toggle" type="checkbox" v-model="todo.completed">
+ <label @dblclick="editTodo(todo)">{{ todo.title }}</label>
+ <button class="destroy" @click="removeTodo(todo)"></button>
+ </div>
+ <input class="edit" type="text"
+ v-model="todo.title"
+ v-todo-focus="todo === editedTodo"
+ @blur="doneEdit(todo)"
+ @keyup.enter="doneEdit(todo)"
+ @keyup.escape="cancelEdit(todo)"
+ >
+ </li>
+ </ul>
+ </section>
+ <footer class="footer" v-if="todos.length">
+ <span class="todo-count">
+ <strong>{{ remaining }}</strong> <span>{{ pluralize(remaining) }} left</span>
+ </span>
+ <ul class="filters">
+ <li><a href="#/all" :class="{ selected: visibility === 'all' }">All</a></li>
+ <li><a href="#/active" :class="{ selected: visibility === 'active' }">Active</a></li>
+ <li><a href="#/completed" :class="{ selected: visibility === 'completed' }">Completed</a></li>
+ </ul>
+ <button class="clear-completed" @click="removeCompleted" v-if="todos.length > remaining">
+ Clear completed
+ </button>
+ </footer>
+ </section>
+</div>
+
+<script>
+const STORAGE_KEY = 'todos-vuejs-3.x'
+const todoStorage = {
+ fetch() {
+ const todos = JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]')
+ todos.forEach((todo, index) => {
+ todo.id = index
+ })
+ todoStorage.uid = todos.length
+ return todos
+ },
+ save(todos) {
+ localStorage.setItem(STORAGE_KEY, JSON.stringify(todos))
+ }
+}
+
+const filters = {
+ all(todos) {
+ return todos
+ },
+ active(todos) {
+ return todos.filter((todo) => {
+ return !todo.completed
+ })
+ },
+ completed(todos) {
+ return todos.filter(function (todo) {
+ return todo.completed
+ })
+ }
+}
+
+const App = {
+ // app initial state
+ data: {
+ todos: todoStorage.fetch(),
+ newTodo: '',
+ editedTodo: null,
+ visibility: 'all'
+ },
+
+ // watch todos change for localStorage persistence
+ watch: {
+ todos: {
+ handler(todos) {
+ todoStorage.save(todos)
+ },
+ deep: true
+ }
+ },
+
+ mounted() {
+ window.addEventListener('hashchange', this.onHashChange)
+ this.onHashChange()
+ },
+
+ computed: {
+ filteredTodos() {
+ return filters[this.visibility](this.todos)
+ },
+ remaining() {
+ return filters.active(this.todos).length
+ },
+ allDone: {
+ get() {
+ return this.remaining === 0
+ },
+ set(value) {
+ this.todos.forEach(function (todo) {
+ todo.completed = value
+ })
+ }
+ }
+ },
+
+ // methods that implement data logic.
+ // note there's no DOM manipulation here at all.
+ methods: {
+ addTodo() {
+ var value = this.newTodo && this.newTodo.trim()
+ if (!value) {
+ return
+ }
+ this.todos.push({
+ id: todoStorage.uid++,
+ title: value,
+ completed: false
+ })
+ this.newTodo = ''
+ },
+
+ removeTodo(todo) {
+ this.todos.splice(this.todos.indexOf(todo), 1)
+ },
+
+ editTodo(todo) {
+ this.beforeEditCache = todo.title
+ this.editedTodo = todo
+ },
+
+ doneEdit(todo) {
+ if (!this.editedTodo) {
+ return
+ }
+ this.editedTodo = null
+ todo.title = todo.title.trim()
+ if (!todo.title) {
+ this.removeTodo(todo)
+ }
+ },
+
+ cancelEdit(todo) {
+ this.editedTodo = null
+ todo.title = this.beforeEditCache
+ },
+
+ removeCompleted() {
+ this.todos = filters.active(this.todos)
+ },
+
+ onHashChange() {
+ var visibility = window.location.hash.replace(/#\/?/, '')
+ if (filters[visibility]) {
+ this.visibility = visibility
+ } else {
+ window.location.hash = ''
+ this.visibility = 'all'
+ }
+ },
+
+ pluralize (n) {
+ return n === 1 ? 'item' : 'items'
+ }
+ },
+
+ directives: {
+ 'todo-focus'(el, binding) {
+ if (binding.value) {
+ el.focus()
+ }
+ }
+ }
+}
+
+Vue.createApp().mount(App, '#app')
+</script>
--- /dev/null
+<script src="../dist/vue.global.js"></script>
+<link rel="stylesheet" href="https://unpkg.com/todomvc-app-css/index.css">
+
+<div id="app">
+ <section class="todoapp">
+ <header class="header">
+ <h1>todos</h1>
+ <input class="new-todo"
+ autofocus autocomplete="off"
+ placeholder="What needs to be done?"
+ v-model="state.newTodo"
+ @keyup.enter="addTodo">
+ </header>
+ <section class="main" v-if="state.todos.length">
+ <input id="toggle-all" class="toggle-all" type="checkbox" v-model="state.allDone">
+ <label for="toggle-all">Mark all as complete</label>
+ <ul class="todo-list">
+ <li v-for="todo in state.filteredTodos"
+ class="todo"
+ :key="todo.id"
+ :class="{ completed: todo.completed, editing: todo === state.editedTodo }">
+ <div class="view">
+ <input class="toggle" type="checkbox" v-model="todo.completed">
+ <label @dblclick="editTodo(todo)">{{ todo.title }}</label>
+ <button class="destroy" @click="removeTodo(todo)"></button>
+ </div>
+ <input class="edit" type="text"
+ v-model="todo.title"
+ v-todo-focus="todo === state.editedTodo"
+ @blur="doneEdit(todo)"
+ @keyup.enter="doneEdit(todo)"
+ @keyup.escape="cancelEdit(todo)"
+ >
+ </li>
+ </ul>
+ </section>
+ <footer class="footer" v-if="state.todos.length">
+ <span class="todo-count">
+ <strong>{{ state.remaining }}</strong>
+ <span>{{ state.remainingText }}</span>
+ </span>
+ <ul class="filters">
+ <li><a href="#/all" :class="{ selected: state.visibility === 'all' }">All</a></li>
+ <li><a href="#/active" :class="{ selected: state.visibility === 'active' }">Active</a></li>
+ <li><a href="#/completed" :class="{ selected: state.visibility === 'completed' }">Completed</a></li>
+ </ul>
+ <button class="clear-completed" @click="removeCompleted" v-if="state.todos.length > remaining">
+ Clear completed
+ </button>
+ </footer>
+ </section>
+</div>
+
+<script>
+const { createApp, reactive, computed, watch, onMounted, onUnmounted } = Vue
+
+const STORAGE_KEY = 'todos-vuejs-3.x'
+const todoStorage = {
+ fetch () {
+ const todos = JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]')
+ todos.forEach((todo, index) => {
+ todo.id = index
+ })
+ todoStorage.uid = todos.length
+ return todos
+ },
+ save (todos) {
+ localStorage.setItem(STORAGE_KEY, JSON.stringify(todos))
+ }
+}
+
+const filters = {
+ all (todos) {
+ return todos
+ },
+ active (todos) {
+ return todos.filter((todo) => {
+ return !todo.completed
+ })
+ },
+ completed (todos) {
+ return todos.filter(function (todo) {
+ return todo.completed
+ })
+ }
+}
+
+function pluralize (n) {
+ return n === 1 ? 'item' : 'items'
+}
+
+const App = {
+ setup () {
+ const state = reactive({
+ todos: todoStorage.fetch(),
+ editedTodo: null,
+ newTodo: '',
+ beforeEditCache: '',
+ visibility: 'all',
+ remaining: computed(() => {
+ return filters.active(state.todos).length
+ }),
+ remainingText: computed(() => {
+ return ` ${pluralize(state.remaining)} left`
+ }),
+ filteredTodos: computed(() => {
+ return filters[state.visibility](state.todos)
+ }),
+ allDone: computed({
+ get: function () {
+ return state.remaining === 0
+ },
+ set: function (value) {
+ state.todos.forEach((todo) => {
+ todo.completed = value
+ })
+ }
+ })
+ })
+
+ watch(() => {
+ todoStorage.save(state.todos)
+ })
+
+ onMounted(() => {
+ window.addEventListener('hashchange', onHashChange)
+ onHashChange()
+ })
+
+ onUnmounted(() => {
+ window.removeEventListener('hashchange', onHashChange)
+ })
+
+ function onHashChange () {
+ const visibility = window.location.hash.replace(/#\/?/, '')
+ if (filters[visibility]) {
+ state.visibility = visibility
+ } else {
+ window.location.hash = ''
+ state.visibility = 'all'
+ }
+ }
+
+ function addTodo () {
+ const value = state.newTodo && state.newTodo.trim()
+ if (!value) {
+ return
+ }
+ state.todos.push({
+ id: todoStorage.uid++,
+ title: value,
+ completed: false
+ })
+ state.newTodo = ''
+ }
+
+ function removeTodo (todo) {
+ state.todos.splice(state.todos.indexOf(todo), 1)
+ }
+
+ function editTodo (todo) {
+ state.beforeEditCache = todo.title
+ state.editedTodo = todo
+ }
+
+ function doneEdit (todo) {
+ if (!state.editedTodo) {
+ return
+ }
+ state.editedTodo = null
+ todo.title = todo.title.trim()
+ if (!todo.title) {
+ removeTodo(todo)
+ }
+ }
+
+ function cancelEdit (todo) {
+ state.editedTodo = null
+ todo.title = state.beforeEditCache
+ }
+
+ function removeCompleted () {
+ state.todos = filters.active(state.todos)
+ }
+
+ return {
+ state,
+ addTodo,
+ removeTodo,
+ editTodo,
+ doneEdit,
+ cancelEdit,
+ removeCompleted
+ }
+ },
+
+ directives: {
+ 'todo-focus': (el, { value }) => {
+ if (value) {
+ el.focus()
+ }
+ }
+ }
+}
+
+createApp().mount(App, '#app')
+</script>