Detailed explanation of implementing memo function in vue.js-JS Tutorial-php.cn

Detailed explanation of implementing memo function in vue.js

巴扎黑

Release： 2017-07-23 15:26:26

Original

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This demo of vue’s implementation of memo function was found by K on github. K thought this was a very simple demo for getting started with vue.js, so I shared it here.

(Respect the results of other people’s work, start with small things ~ Original github address of the demo:)

1. Achieve results

2. Code display

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>备忘录</title><link rel="stylesheet" type="text/css" href="css/index.css?1.1.11" /><style>[v-cloak] { display: none; }</style></head><body><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-show="todos.length" v-cloak><input class="toggle-all" type="checkbox" v-model="allDone"><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.esc="cancelEdit(todo)">  </li></ul>  </section>  <footer class="footer" v-show="todos.length" v-cloak><span class="todo-count">  <strong>{{ todos.length }}</strong> {{ remaining | pluralize }} left</span><ul class="filters">  <li><a href="#/all" :class="{ selected: visibility == &#39;all&#39; }">All</a></li>  <li><a href="#/active" :class="{ selected: visibility == &#39;active&#39; }">Active</a></li>  <li><a href="#/completed" :class="{ selected: visibility == &#39;completed&#39; }">Completed</a></li></ul><button class="clear-completed" @click="removeCompleted" v-show="todos.length > remaining">  Clear completed</button>  </footer></section><footer class="info"><p>双击编辑一条备忘录</p></footer></body><script language="JavaScript" src="js/director.js?1.1.11"></script><script language="JavaScript" src="js/vue.js?1.1.11"></script><script language="JavaScript" src="js/index_vue.js?1.1.11"></script></html>

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// 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 todos.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')

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