Vue.js是一款流行的JavaScript框架,它提供了许多强大的功能来简化前端开发。在本篇博客中,我们将深入探讨Vue的一些高级特性,包括插值、指令、过滤器、计算属性和监听器。通过理解和灵活运用这些功能,我们可以更好地构建出丰富、高效的Vue应用程序。
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js">script>
<title>title>
<style>
.font-30{
font-size: 30px;
}
style>
head>
<body>
<div id = "app">
{{msg}}<br /><hr />
html,class绑定-------<b :class="msg3" v-html="msg2">b><br /><hr />
表达式----<br />
{{num+1}}<br />
{{str.substring(2,4)}}<br />
<input v-model="ok" />
{{ok==true?'yes':'no'}}<br /><hr />
div>
<script>
new Vue({
el:"#app",
data(){
return{
msg:'hello vue',
msg2:'msg2样式',
msg3:'font-30',
num:6,
str:'沉谭秋叶',
ok:true
}
}
})
script>
body>
html>
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js">script>
<title>title>
<style>
.font-30{
font-size: 30px;
}
style>
head>
<body>
<div id = "app">
<input v-model="score" />
<b v-if="score < 60">不合格b>
<b v-else-if="score >= 60 && score < 70">及格b>
<b v-else-if="score >= 70 && score < 80">一般b>
<b v-else-if="score >= 80 && score < 90">良好b>
<b v-else>优秀b>
<br /><hr />
v-show
<b v-show="isShow">xxxb>
<br /><hr />
v-for
<b v-for="i in arr">{{i}}-b>
<b v-for="i in arrs">{{i.name}}-{{i}}=b> <br /><hr />
<select>
<option>请选择option>
<option v-for="i in arrs" :value="i.id">{{i.name}}option>
select>
<br /><hr />
<div v-for="i in arrs">
<input type="checkbox" name="hobby" :value="i.id" />{{i.name}}
div>
<br /><hr />
<input v-model="evename"/>
<button v-on:[evename]="text">点击button>
div>
<script>
new Vue({
el:"#app",
data(){
return{
score:69,
isShow:false,
arr:['a','b','c','d'],
arrs:[{name:'小王',id:1},{name:'小李',id:2},{name:'小桂',id:3},{name:'小勇',id:4}],
evename:'click'
}
},methods:{
text(){
alert('点击了!!')
}
}
})
script>
body>
html>
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="jquery.js">script>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js">script>
<script src="date.js">script>
<title>title>
head>
<body>
<div id = "app">
{{msg}}<br>
{{msg | filter1}} <br>
{{msg | filter1 | filter2}}<br>
{{msg | filter3(3,7)}}<br>
<hr>
{{time}}<br>
{{time | filterName}}
div>
<script>
Vue.filter('filterName', function (value) {
// value 表示要过滤的内容
return fmtDate(value);
});
new Vue({
el:"#app",
filters:{
'filter1':function(v){
return v.substring(0,5)
},
'filter2':function(v){
return v.substring(1,3)
},
'filter3':function(v,begin,end){
return v.substring(begin,end)
}
},
data(){
return{
msg:'允许你自定义过滤器,被用作一些常见的文本格式化,格式如下',
time:new Date()
}
}
})
script>
body>
html>
DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js">script>
<title>title>
<style>
.font-30{
font-size: 30px;
}
style>
head>
<body>
<div id = "app">
{{msg}}<br /><hr />
单价<input v-model="price"/>
数量<input v-model="num"/>
小计{{count}}
<br />
千米<input v-model="km"/><br />
米<input v-model="m"/>
div>
<script>
new Vue({
el:"#app",
data(){
return{
msg:'hello vue',
price:88,
num:1,
m:1000,
km:1
}
},computed:{
count:function(){
return this.price*this.num
}
},watch:{
km:function(v){
this.m = parseInt(v)*1000;
},
m:function(v){
this.km = parseInt(v)/1000;
}
}
})
script>
body>
html>
//给Date类添加了一个新的实例方法format
Date.prototype.format = function (fmt) {
//debugger;
var o = {
"M+": this.getMonth() + 1, //月份
"d+": this.getDate(), //日
"h+": this.getHours(), //小时
"m+": this.getMinutes(), //分
"s+": this.getSeconds(), //秒
"q+": Math.floor((this.getMonth() + 3) / 3), //季度
"S": this.getMilliseconds() //毫秒
};
if (/(y+)/.test(fmt))
fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
for (var k in o)
if (new RegExp("(" + k + ")").test(fmt))
fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
return fmt;
};
function fmtDate(date, pattern) {
var ts = date.getTime();
var d = new Date(ts).format("yyyy-MM-dd hh:mm:ss");
if (pattern) {
d = new Date(ts).format(pattern);
}
return d.toLocaleString();
};
DOCTYPE html>
<html>
<head>
<title>购物车title>
<script src="https://cdn.bootcdn.net/ajax/libs/vue/2.6.10/vue.js">script>
<style>
table {
border-collapse: collapse;
width: 100%;
}
th, td {
border: 1px solid black;
padding: 8px;
text-align: left;
}
th {
background-color: #f2f2f2;
}
.btn-group {
display: flex;
justify-content: space-between;
}
style>
head>
<body>
<div id="app">
<h1>购物车h1>
<table>
<thead>
<tr>
<th>商品th>
<th>价格th>
<th>数量th>
<th>小计th>
<th>操作th>
tr>
thead>
<tbody>
<tr v-for="v in arr" >
<td>{{ v.name }}td>
<td>{{ v.price }}td>
<td>
<input type="number" v-model="v.quantity" @input="xj(v)">
td>
<td>{{ v | filter1 }}td>
<td class="btn-group">
<button @click="add(v)">+button>
<button @click="jdd(v)">-button>
td>
tr>
tbody>
<tfoot>
<tr>
<td colspan="3">总计td>
<td>{{ total }}td>
tr>
tfoot>
table>
div>
<script>
new Vue({
el: '#app',
data: {
arr: [
{ name: '尿不湿', price: 49, quantity: 1, subtotal: 49 },
{ name: '狼牙棒', price: 28, quantity: 1, subtotal: 28 },
{ name: '鸡毛卷', price: 36, quantity: 1, subtotal: 36 }
]
},
computed: {
total: function() {
return this.arr.reduce((sum, v) => sum + v.subtotal, 0);
}
},
methods: {
xj: function(v) {
v.subtotal = v.price * v.quantity;
},
add: function(v) {
v.quantity++;
this.xj(v);
},
jdd: function(v) {
if (v.quantity > 0) {
v.quantity--;
this.xj(v);
}
}
},
filters: {
'filter1': function(v) {
return v.price * v.quantity;
}
}
});
script>
body>
html>
通过本篇博客的学习,我们深入理解了Vue的插值、指令、过滤器、计算属性和监听器这些高级特性。这些功能不仅可以帮助我们更好地处理数据绑定和DOM操作,还能提升应用程序的性能和开发效率。在实际项目中,我们应根据具体需求合理运用这些功能,以构建出饱满、高效的Vue应用程序。