指令修饰符
v-model.trim
v-model.number
@事件名.stop @click.stop
@事件名.prevent
@keyup.enter
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<script src="../vue.js"></script><style>#app {margin: 50px 50px;}* {box-sizing: border-box;margin: 0;padding: 0;list-style: none;}.head {width: 243px;}input {height: 30px;vertical-align: middle;}.head button {height: 30px;}.body li {width: 234px;height: 50px;display: flex;line-height: 50px;background-color: #de8282;border-bottom: black solid 2px;}.body li .content {flex: 1;}.body li button {height: 50%;align-self: center;display: none;}.body li:hover button {display: block;width: 20px;}.footer {width: 234px;display: flex;justify-content: space-between;}
</style><body><div id="app"><h1>小黑记事本</h1><div class="head"><input @keyup.enter="add" v-model="todoName" type="text" placeholder="请输入待办事项"><button @click="add">添加任务</button></div><section class="body"><ul><li v-for="(item,index) in todoList" :key="item.id"><span>{{index+1}}</span><span class="content">{{item.name}}</span><button @click="del(item.id)">×</button></li></ul></section><div v-show="todoList.length>0" class="footer"><span>合计：<strong>{{todoList.length}}</strong></span><button @click="clear()">清空任务</button></div></div>
</body>
<script>const app = new Vue({el: '#app',data: {todoName: '',todoList: [{ id: 1, name: '吃水果' },{ id: 2, name: '喝酸奶' }]},methods: {del(tt) {this.todoList = this.todoList.filter(item => item.id != tt)},add() {if (this.todoName.trim() == '') {alert('请输入内容')return}this.todoList.unshift({id: +new Date(),name: this.todoName})this.todoName = ''},clear() {this.todoList = []}}})
</script></html>
v-bind基础 （回顾Day1
v-bind进阶
v-bind对于样式控制的增强 —— 操作class
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<script src="../vue.js"></script>
<style>.box {width: 100px;height: 100px;border: 2px solid black;}.pink {background-color: pink;}.big {width: 300px;height: 300px;}
</style><body><div id="app"><div class="box" :class="{pink:true,big:true}">Hello</div><div class="box" :class="['pink','big']">Hello</div></div>
</body>
<script>const app = new Vue({el: '#app',data: {},method: {}})
</script></html>
[案例]——京东秒杀
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<script src="../vue.js"></script>
<link rel="stylesheet" href="../base.css">
<style>ul {display: flex;border-bottom: rgb(245, 12, 12) 2px solid;}li a {display: block;width: 70px;height: 30px;line-height: 30px;text-align: center;}.mouseover_active {background-color: rgba(247, 101, 101, 0.874);}.active {background-color: red;}
</style><body><div id="app"><ul><li v-for="(item , index) in list" :key="item.id" @mouseover="activeIndex2=index"@click="activeIndex1=index"><a :class="{mouseover_active:index==activeIndex2,active:index==activeIndex1 }"href="#">{{item.name}}</a></li></ul></div>
</body>
<script>const app = new Vue({el: '#app',data: {activeIndex2: 0,activeIndex1: 0,list: [{ id: 1, name: '京东秒杀' },{ id: 2, name: '每日特价' },{ id: 3, name: '品类秒杀' },]},method: {}})
</script></html>
v-bind 对于样式控制的增强——style操作
[案例]—— 进度条
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>Document</title>
</head>
<script src="../vue.js"></script>
<link rel="stylesheet" href="../base.css">
<style>#app {margin: 10px;}.progress {width: 300px;height: 40px;margin-bottom: 40px;background-color: #cdf92c;border-radius: 25px;padding: 5px;}.inner {background-color: #0df6c7;border-radius: 25px;height: 30px;}.low {background-color: #92ee61;}.high {background-color: rgb(141, 179, 216);}.over {background-color: rgb(0, 128, 255);}.inner span {width: 100%;text-align: right;display: block;line-height: 90px;}
</style><body><div id="app"><div class="progress"><div class="inner" :class="{low:num<50,high:num>70,over:num==100}" :style="{width:num+'%'}"><span>{{num}}%</span></div></div><button @click="num=25">设置25%</button><button @click="num=50">设置50%</button><button @click="num=75">设置75%</button><button @click="num=100">设置100%</button></div>
</body>
<script>const app = new Vue({el: '#app',data: {num: 10},method: {}})
</script></html>
