v-show 隐藏
v-if 删除
v-on 对应操作事件简写 @
v-bind 对应标签属性 简写 ：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0,user-scalable=no">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Vue记事本</title>
</head>
<body>
<section id="toapp">
<header>
<h1>记事本</h1>
<input v-model="inputvl" autofocus="autofocus" autocomplete="off" placeholder="请输入" @keyup.enter="add">
</header>
<section>
<ul>
<li v-for="(item,index) in list">
<span>
{{index+1}}
</span>
<label>{{item}}</label>
<button @click="remove(index)">删除</button>
</li>
</ul>
</section>
<footer>
<span v-show="list.length!=0">{{list.length}}</span>
<button v-show="list.length!=0" @click="clear">清空列表</button>
</footer>
</section>
<script src="https://cdn.jsdelivr.net/npm/vue@2.6.14/dist/vue.js"></script>
<script>
const vm = new Vue({
el:"#toapp",
data:{
list:[
"吃饭",
"睡觉",
"打豆豆"
],
inputvl:"新增数据",
},
methods:{
add:function(){
this.list.push(this.inputvl);
},
remove:function(index){
this.list.splice(index,1)
},
clear:function(){
this.list=[]
}
}
}
)
</script>
</body>
</html>
