vue.js实现备忘录功能的方法

   <title>备忘录</title>[v-cloak] { display: none; } <section class="todoapp"> <header class="header"> <h1>todos</h1></header><section class="main"> <ul class="todo-list"> <li class="todo"> <div class="view"> <label>{{ todo.title }}</label><button class="destroy"></button></div></li></ul></section><footer class="footer"> <span class="todo-count"> <strong>{{ todos.length }}</strong> {{ remaining | pluralize }} left </span><ul class="filters"> <li>All</li><li>Active</li><li>Completed</li></ul><button class="clear-completed"> remaining"> Clear completed </button></footer></section><footer class="info"> <p>双击编辑一条备忘录</p></footer>

 // 本地缓存设置 // 防止页面关闭后，数据全部丢失的问题 var STORAGE_KEY = 'todos-vuejs-2.0' var todoStorage = { // 获取本地存储中的内容 fetch:function(){ // JSON.parse()解析一个json字符串 //  localStorage.getItem 从本地存储中获取STORAGE_KEY字段的值 var todos = JSON.parse(localStorage.getItem(STORAGE_KEY)||'[]'); //  foreach遍历todos，两个参数分别为遍历出的每一个子单元及对应的索引 todos.forEach(function(todo,index){ todo.id = index; }) todoStorage.uid = todos.length; return todos; }, // 保存时将内容写进本地存储 save:function(todos){ // localStorage.setItem 将todos转化成字符串存入本地存储，键名为STORAGE_KEY localStorage.setItem(STORAGE_KEY,JSON.stringify(todos)) } } // 可视化状态过滤设置 //  包括全选（all）、选择未完成（active）、选择已完成（completed） var filters = { all:function(todos){ return todos; }, //  filter() 方法创建一个新的数组，新数组中的元素是通过检查指定数组中符合条件的所有元素。 active:function(todos){ return t<div style="color:transparent">本文来源gaodai.ma#com搞##代!^码网(</div>odos.filter(function(todo){ return !todo.completed; }) }, completed:function(todos){ return todos.filter(function(todo){ return todo.completed; }) } } // vue实例化 var app = new Vue({ //  data 参数设置 data:{ todos:todoStorage.fetch(), newTodo:'', editedTodo:null, visibility:'all' }, //  watch 监视todos在本地储存中的变化 watch:{ todos:{ handler:function(todos){ todoStorage.save(todos) }, deep:true } }, //  computed 检测数据发生变动时执行函数 computed:{ filteredTodos:function(){ return filters[this.visibility](this.todos) }, remaining:function(){ return filters.active(this.todos).length }, allDone:{ get:function(){ return this.remaining === 0 }, set:function(value){ this.todos.forEach(function(todo){ todo.completed = value }) } } }, //  methods 方法设置 methods:{ addTodo:function(){ var value = this.newTodo && this.newTodo.trim() if(!value){ return; } this.todos.push({ id:todoStorage.uid++, title:value, completed:false }) this.newTodo = '' }, removeTodo:function(todo){ this.todos.splice(this.todos.indexOf(todo),1) }, editTodo:function(todo){ this.beforeEditCache = todo.title; this.editedTodo = todo }, doneEdit:function(todo){ if(!this.editedTodo){ return; }; this.editedTodo = null; todo.title = todo.title.trim() if(!todo.title){ this.removeTodo(todo) } }, cancelEdit:function(todo){ this.editedTodo = null; todo.title = this.beforeEditCache }, removeCompleted:function(){ this.todos = filters.active(this.todos) } }, directives:{ 'todo-focus':function(el,binding){ if(binding.value){ el.focus() } } } }) // hashchange URL的片段标识符更改触发 function onHashChange(){ var visbility = window.location.hash.replace(/#\/?/, ''); if(filters[visbility]){ app.visibility = visbility }else{ window.location.hash = ''; app.visbility = 'all' } } window.addEventListener('hashchange',onHashChange) onHashChange() // mount 手动挂载 app.$mount('.todoapp')