-
功能
- 新增
- 删除
- 统计
- 清空&隐藏
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<title>便签本</title>
<style>
#app {
400px;
/* 标准流布局，盒子不给height就可以了哈哈哈 */
border: 1px solid grey;
padding-top: 4px;
}
h2 {
text-align: center;
}
#app li {
position: relative;
310px;
height: 50px;
line-height: 50px;
border: 1px solid grey;
padding-left: 30px;
list-style: none;
}
#app li:hover i {
display: block;
}
#app input {
height: 50px;
margin-left: 40px;
border: 1px solid grey;
307px;
outline: none;
font-size: 20px;
padding-left: 30px;
}
#app i {
display: none;
color: red;
position: absolute;
right: 30px;
top: 3px;
}
footer {
position: relative;
}
footer p {
position: absolute;
right: 21px;
top: 2px;
margin: 0;
}
</style>
</head>
<body>
<div id="app">
<h2>记事本</h2>
<input type="text" v-model="addInfo" @keyup.enter="add" placeholder="请输入任务">
<ul>
<li v-for="(iterm,num) in arr">{{num+1}} {{iterm}}
<i @click="remove(index)">x</i>
<!-- index妙啊 -->
</li>
<br>
<footer v-show="arr.length!=0">
<strong>{{arr.length}}</strong> iterms left
<p @click="clear">clear</p>
</footer>
</ul>
</div>
<script>
var notebook = new Vue({
el: "#app",
data: {
addInfo: "",
arr: ["吃饭", "睡觉", "打豆"]
},
methods: {
add: function() {
this.arr.push(this.addInfo);
// push的新元素放括号里
},
remove: function(index) {
this.arr.splice(index, 1);
},
// 新增元素的索引不对呢
// 形参index不需要this
sum: function() {
alert(arr.length);
},
clear: function() {
this.arr = [];
}
}
})
</script>
</body>
</html>