一劣像、新增數(shù)據(jù)

1要尔、輸入框

第一層用section，class="todoapp"
第二層用header元素歌豺，class="header"
第三層用input元素，class="new-todo"
input輸入框中設(shè)置數(shù)據(jù)雙向綁定v-model="newTodo"心包；設(shè)置綁定行為@keyup.enter="addTodo"

2类咧、列表顯示欄

第二層用section，class="main"
第三層用<ul>元素蟹腾，class="todo-list"
第四層用<li>元素痕惋，class="todo" ；用v-for="todo in todos"循環(huán)顯示數(shù)據(jù)娃殖。{{todo.title}}渲染數(shù)據(jù)

定義輸入框和列表框

3值戳、實例設(shè)置

el='.todoapp' ；el定位最外圍section的todoapp類
data:{newTodo:''}炉爆；定義input雙向綁定newTodo為空
data:{todos:[ ]}堕虹；定義todos為數(shù)組
methods:{addTodo(){}}卧晓；定義方法，
1)獲取newTodo數(shù)據(jù)：var value=this.newTodo
2)添加到todos數(shù)組內(nèi),默認任務(wù)完成狀態(tài)是false：this.todos.push({title:value,completed:false})
3)添加數(shù)組成功后清空input數(shù)據(jù)：this.newTodo=' '

2017-12-06 14-55-01屏幕截圖.png

效果圖

4赴捞、設(shè)置CSS更改外觀

html,
body {
    margin: 0;
    padding: 0;
    font: 14px 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.4em;
    background: #f5f5f5;
    color: #4d4d4d;
    min-width: 230px;
    max-width: 550px;      /*最寬*/
    margin: 0 auto;        /*居中*/
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-weight: 100;  /*400 等同于 normal逼裆，而 700 等同于 bold*/
}


.todoapp {
    background: #fff;   
    margin: 130px 0 40px 0;  /*內(nèi)上距留130px；內(nèi)下距留40px*/    
    position: relative;
    box-shadow: 0 2px 4px 0 rgba(0, 0, 0, 0.2),
                0 25px 50px 0 rgba(0, 0, 0, 0.1);
}

.todoapp h1 {
    position: absolute;   /**/
    top: -155px;    /*todo下面留25px*/
    width: 100%;
    font-size: 100px;
    font-weight: 100;
    text-align: center;
    color: rgba(175, 47, 47, 0.15);
    -webkit-text-rendering: optimizeLegibility;
    -moz-text-rendering: optimizeLegibility;
    text-rendering: optimizeLegibility;
}

.todoapp input::-webkit-input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}

.todoapp input::input-placeholder {
    font-style: italic;
    font-weight: 300;
    color: #e6e6e6;
}



.new-todo {
    position: relative;
    margin: 0;
    width: 100%;
    font-size: 24px;
    font-family: inherit;
    font-weight: inherit;
    line-height: 1.4em;
    border: 0;
    color: inherit;
    padding: 6px;
    border: 1px solid #999;
    box-shadow: inset 0 -1px 5px 0 rgba(0, 0, 0, 0.2);
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: 16px 16px 16px 60px;
    border: none;
    background: rgba(0, 0, 0, 0.003);
    box-shadow: inset 0 -2px 1px rgba(0,0,0,0.03);
}

效果圖