"todoList妙味"学习总结

1、v-bind  主要用于属性绑定
:class="{completed: item.isChecked}",它会将{}里面的内容解析为js表达式
 
2、vue提供了一组方法,对数组进行操作时,会触发视图更新,eg:push、pop、shift、unshift、splice、sort、reverse
这几个方法是在原生的基础上 ,vue再进行重新封装的方法。
3、自定义指令
vue可以设置自己的指令,钩子函数:updete被绑定元素所在的模板更新时调用,钩子函数中的参数,el:指令所绑定的元素,可以用来直接操作DOM;binding一个对象;value:为binding对象中,expression:"edtorTodos === item"的值决定,若expression为true,value即为true;
4、filter
computed:{
//要学会用filter
noCheckeLength:function(){
return this.list.filter(function(item){
return !item.isChecked
}).length
},
filteredList:function(){
//找到了过滤函数,就返回过滤后的数据;如果没有返回所有数据
return filter[this.visibility] ? filter[this.visibility](list) : list;
 
}
},
5、watch的深度监控,监控list这个属性,当这个属性对应的值发生变化就会执行函数,当设置deep这个属性时,无论是list这个对象变化了,还是里面的一个属性值变化了,都会触发监控事件。
watch:{
// list:function(){ //监控list这个属性,当这个属性对应的值发生变化就会执行函数
// store.save("miaov-new-class",this.list);
// },
list:{
handler:function(){
store.save("miaov-new-class",this.list);
},
deep:true
}
},
6、根据hash值实现数据的过滤,可以通过计算属性computed实现
//过滤的时候有三种情况 all finished unfinished
var filter = {
all:function(list){
return list;
},
finished:function(list){
return list.filter(function(item){
return item.isChecked;
})
},
unfinished:function(list){
return list.filter(function(item){
return !item.isChecked;
})
}
}
 
computed:{
filteredList:function(){
//找到了过滤函数,就返回过滤后的数据;如果没有返回所有数据
return filter[this.visibility] ? filter[this.visibility](list) : list;
}
},
 
。。。
//通过hash对数据进行筛选,计算属性也可以进行数据过滤
function watchHashChange(){
var hash = window.location.hash.slice(1);
//这里要用vm,不能用this
vm.visibility = hash;
}
watchHashChange();
window.addEventListener("hashchange",watchHashChange);
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="../index.css">
    <script src="../vue.js"></script>
</head>
<body>
    <div class="page-top">
        <div class="page-content">
            <h2>任务计划列表</h2>
        </div>
    </div>
    <div class="main">
        <h3 class="big-title">添加任务:</h3>
        <input 
            placeholder="例如:吃饭睡觉打豆豆;    提示:+回车即可添加任务" 
            class="task-input" 
            type="text"
            v-model="todo"
             @keyup.13="addTodo(123,$event)"
        />
        <ul class="task-count" v-show="list.length">
            <li>{{noCheckeLength}}个任务未完成</li>
            <li class="action">
                <a  href="#all">所有任务</a>
                <a href="#unfinished">未完成的任务</a>
                <a href="#finished">完成的任务</a>
            </li>
        </ul>
        <h3 class="big-title">任务列表:</h3>
        <div class="tasks">

            <span class="no-task-tip" v-show="!list.length">还没有添加任何任务</span>
            <ul class="todo-list ">
                <li class="todo" :class="{completed: item.isChecked,editing: item === edtorTodos}" v-for="item in filteredList" >
                    <div class="view">
                        <input class="toggle" type="checkbox" v-model='item.isChecked'/>
                        <label @dblclick="edtorTodo(item)">{{item.title}}</label>
                        <button class="destroy"  @click="deleteTodo(item)"></button>
                    </div>
                    <input 
                        v-foucs="edtorTodos === item"
                        :class="edtorTodos === item" 
                        class="edit" 
                        type="text" 
                        v-model = "item.title"
                        @blur="edtorTodoed(item)"
                        @keyup.13="edtorTodoed(item)"
                        @keyup.esc="cancelTodo(item)"
                    />
                   
                </li>
            </ul>
        </div>
    </div>
       
    </div>
    <script src="./app2.js"></script>
</body>
</html>

index.css

body {
    margin:0;
    background-color: #fafafa;
    font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

h2{
    margin:0;
    font-size: 12px;
}
a {
    color: #000;
    text-decoration: none;
}

input {
    outline: 0;
}

button {
    margin: 0;
    padding: 0;
    border: 0;
    background: none;
    font-size: 100%;
    vertical-align: baseline;
    font-family: inherit;
    font-weight: inherit;
    color: inherit;
    outline: 0;
}

ul {
    padding:0;
    margin:0;
    list-style: none;
}

.page-top {
    width: 100%;
    height: 40px;
    background-color: #db4c3f;
}

.page-content {
    width: 50%;
    margin: 0px auto;
}

.page-content h2{
    line-height: 40px;
    font-size: 18px;
    color: #fff;
}

.main {
    width: 50%;
    margin: 0px auto;
    box-sizing:border-box;
}

.task-input {
    width: 99%;
    height:30px;
    outline: 0;
    border: 1px solid #ccc;
}

.task-count{
    display: flex;
    margin:10px 0;
}

.task-count li {
    padding-left: 10px;
    flex: 1;
    color: #dd4b39;
}

.task-count li:nth-child(1){
    padding: 5px 0 0 10px;
}

.action {
    text-align: center;
    display: flex;
}
.action a {
    margin: 0px 10px;
    flex: 1;
    padding: 5px 0;
    color: #777;

}

.action a:nth-child(3){
    margin-right: 0;
}

.active {
    border: 1px solid rgba(175, 47, 47, 0.2);
}

.tasks {
    background-color: #fff;
}
.no-task-tip {
    padding:10px 0 10px 10px;
    display: block;
    border-bottom: 1px solid #ededed;
    color:#777;
}

.big-title {
    color: #222;
}


.todo-list {
    margin: 0;
    padding: 0;
    list-style: none;
}

.todo-list li {
    position: relative;
    font-size: 16px;
    border-bottom: 1px solid #ededed;
}

.todo-list li:hover {
    background-color: #fafafa;
}


.todo-list li.editing {
    border-bottom: none;
    padding: 0;
}

.todo-list li.editing .edit {
    display: block;
    width: 506px;
    padding: 13px 17px 12px 17px;
    margin: 0 0 0 43px;
}

.todo-list li.editing .view {
    display: none;
}

.todo-list li .toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 5px;
    bottom: 0;
    margin: auto 0;
    border: none; /* Mobile Safari */
    -webkit-appearance: none;
    appearance: none;
}

.toggle {
    text-align: center;
    width: 40px;
    /* auto, since non-WebKit browsers doesn't support input styling */
    height: auto;
    position: absolute;
    top: 5px;
    bottom: 0;
    margin: auto 0;
    border: none; /* Mobile Safari */
    -webkit-appearance: none;
    appearance: none;
}

 .toggle:after {
    content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="40" fill="none" stroke="#ededed" stroke-width="3"/></svg>');
}

.toggle:checked:after {
    content: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="40" height="40" viewBox="-10 -18 100 135"><circle cx="50" cy="50" r="40" fill="none" stroke="#bddad5" stroke-width="3"/><path fill="#5dc2af" d="M72 25L42 71 27 56l-4 4 20 20 34-52z"/></svg>');
}

.todo-list li label {
    white-space: pre-line;
    word-break: break-all;
    padding: 15px 60px 15px 15px;
    margin-left: 45px;
    display: block;
    line-height: 1.2;
    transition: color 0.4s;
}

.todo-list li.completed label {
    color: #d9d9d9;
    text-decoration: line-through;
}

/*.tip-toggle {
    padding-left: 0;
    position: relative;
}

.tip-toggle .toggle {
    top: -2px;
}

.tip-toggle span {
    margin-left: 45px;
}*/

.todo-list li .destroy {
    display: none;
    position: absolute;
    top: 0;
    right: 10px;
    bottom: 0;
    width: 40px;
    height: 40px;
    margin: auto 0;
    font-size: 30px;
    color: #cc9a9a;
    margin-bottom: 11px;
    transition: color 0.2s ease-out;
}

.todo-list li .destroy:hover {
    color: #af5b5e;
}

.todo-list li .destroy:after {
    content: '×';
}

.todo-list li:hover .destroy {
    display: block;
}

.todo-list li .edit {
    display: none;
}

.todo-list li.editing:last-child {
    margin-bottom: -1px;
}

app2.js

//存取localStorage中的数据

var store = {
    save(key,value){
        localStorage.setItem(key,JSON.stringify(value));
    },
    fetch(key){
        return JSON.parse(localStorage.getItem(key)) || [];
    }
}

/*var list = [
    {
        title:"吃饭打豆豆1",
        isChecked:true // 状态为false,为不选中  任务未完成
    },
    {
        title:"吃饭打豆豆2",
        isChecked:false // 状态为false,为不选中  任务未完成
    }
];*/

//取出所有的值
var list = store.fetch("miaov-new-class");

//过滤的时候有三种情况 all finished unfinished

var filter = {
    all:function(list){
        return list;
    },
    finished:function(list){
        return list.filter(function(item){
            return item.isChecked;
        })
    },
    unfinished:function(list){
        return list.filter(function(item){
            return !item.isChecked;
        })
    }
}

var vm = new Vue({
    el:'.main',
    data:{
        list:list,
        edtorTodos:'',//记录正在编辑的数据
        beforeTitle:'', //记录正在编辑的数据的title
        todo:'',
        visibility: "all" //通过这个属性值的变化对数据进行筛选
    },
    watch:{
        // list:function(){  //监控list这个属性,当这个属性对应的值发生变化就会执行函数
        //     store.save("miaov-new-class",this.list);
        // },
        list:{
            handler:function(){
                store.save("miaov-new-class",this.list);
            },
            deep:true
        }
    },
    computed:{
        //要学会用filter
        noCheckeLength:function(){
            return this.list.filter(function(item){
                return !item.isChecked
            }).length
        },
        filteredList:function(){            
            //找到了过滤函数,就返回过滤后的数据;如果没有返回所有数据
            return filter[this.visibility] ? filter[this.visibility](list) : list;

        }
    },
    methods:{
        // addTodo:function(){

        // },
        //es6简写模式,事件处理函数中的this指向当前的实例,
        //事件处理函数中存在事件对象ev,若函数中不传参数,默认第一个参数为事件对象;
        //若传入参数,则需要在页面上写入第二个参数$event,才是事件对象。
        addTodo(a,ev){
                console.log(ev);
                this.list.push({
                    title:this.todo,
                    isChecked:false,
                })
            
        },
        deleteTodo(todo){ //删除任务
            console.log(todo);
            var index = this.list.indexOf(todo);
            console.log(index);
            this.list.splice(index,1);

        },
        //通过数据的类控制显示和隐藏,主要的类名为editing
        edtorTodo(todo){  //编辑任务
            console.log(todo);
            //编辑任务的时候,记录一下编辑这条任务的title,方便在取消编辑的时候重新给之前的title
            this.beforeTitle = todo.title;
            this.edtorTodos = todo;
        },
        edtorTodoed(todo){ //编辑任务成功
            this.edtorTodos = '';
        },
        cancelTodo(todo){  //取消编辑任务

            todo.title = this.beforeTitle;

            this.beforeTitle = '';

            //让div显示出来,input隐藏
            this.edtorTodos = '';
        }
    },
    directives:{
        //v-foucs="edtorTodos === item" 当改变了,会触发自定义指令中的钩子函数update
        "foucs":{
            update(el,binding){
                if(binding.value){
                    el.focus();
                }
            }
        }
    }
})
//通过hash对数据进行筛选,计算属性也可以进行数据过滤
function watchHashChange(){
    var hash = window.location.hash.slice(1);
    //这里要用vm,不能用this
    vm.visibility = hash;
    
}

watchHashChange();

window.addEventListener("hashchange",watchHashChange);

 

posted @ 2017-07-25 17:03  未知小未来  阅读(400)  评论(0编辑  收藏  举报