head
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/lodash.min.js"></script>
<style>
.active {
color: skyblue;
}
.text-danger {
color: red;
}
div {
font-size: 14px;
font-weight: normal;
color: grey;
}
.title {
font-size: 22px;
font-weight: bolder;
color: skyblue;
}
</style>
</head>
实例1：
<div id="app1">
<div class="title">(1) app1 插值表达式</div>
{{message}}
</div>
var app = new Vue({
el: "#app1",
data: {
message: 'hello vue'
}
})
实例2：
<div id="app2">
<div class="title">(2) app2 v-bind</div>
<span v-bind:title="message">鼠标悬停几秒看效果</span>
</div>
var app2 = new Vue({
el: "#app2",
data: {
message: '页面加载于 ' + new Date().toLocaleString()
}
})
实例3：
<div id="app3">
<div class="title">(3) app3 v-if</div>
<p v-if="seen">现在你看到我了</p>
</div>
var app3 = new Vue({
el: "#app3",
data: {
seen: true
}
})
实例4：
<div id="app4">
<div class="title">(4) app4 v-for</div>
<ol>
<li v-for="todo in todos">{{todo.text}}</li>
</ol>
</div>
var app4 = new Vue({
el: "#app4",
data: {
todos: [
{ id: 1, text: '学习js' },
{ id: 2, text: '学习vue' },
{ id: 3, text: '学习node' },
]
}
})
实例5：
<div id="app5">
<div class="title">(5) app5 v-on:click</div>
<p>{{message}}</p>
<button v-on:click="reverseMessage">逆转消息</button>
</div>
var app5 = new Vue({
el: '#app5',
data: {
message: 'hello vue'
},
methods: {
reverseMessage: function () {
this.message = this.message.split('').reverse().join('')
}
}
})
实例6：
<div id="app6">
<div class="title">(6) app6-双向数据绑定</div>
<p>{{message}}</p>
<input v-model="message">
</div>
var app6 = new Vue({
el: '#app6',
data: {
message: 'klll dss'
}
})
实例7：
<div id="app7">
<div class="title">(7) app7-v-html-组件-绑定class对象</div>
<div v-bind:class="{active:isActive}">1样式测试-绑定的数据对象定义在模板里</div>
<div v-bind:class="classObj">2样式测试-绑定的数据对象定义在data中</div>
<div v-bind:class="classObj1">3样式测试-绑定的数据对象是一个返回对象的计算属性</div>
<div v-bind:class="[activeClass,errorClass]">4样式测试-把数组传给v-bind:class以应用一个class列表</div>
<div v-bind:class="[isActive?activeClass:'',errorClass]">5样式测试-根据条件切换列表中的class</div>
<div v-bind:class="[{active:isActive},errorClass]">6样式测试-根据条件切换列表中的class-数组语法中可以使用对象语法简单</div>
<div v-bind:style="{color:activeColor,fontSize:fontSize+'px'}">7样式测试-绑定内联样式-对象语法</div>
<div v-bind:style="styleObject">8样式测试-绑定内联样式对象</div>
<ol>
<todo-item v-for="item in groceryList" v-bind:todo="item" v-bind:key="item.id"></todo-item>
</ol>
<p>Using mustaches: {{ rawHtml }}</p>
<!-- v-html把其当成html进行解析，span内容将会替换成属性值rawHtml，直接作为html，忽略解析属性值中的数据绑定 -->
<p>Using v-html directive: <span v-html="rawHtml"></span></p>
</div>
// 全局注册组件,app7内的地方都可以引用
Vue.component('todo-item', {
props: ['todo'],
template: `<li v-bind:id="todo.id">{{todo.text}}</li>`
})
var app7 = new Vue({
el: '#app7',
data: {
groceryList: [
{ id: 2, text: '蔬菜' },
{ id: 3, text: '奶酪' },
{ id: 4, text: '随便时代开始的但是' }
],
rawHtml: "<span style='color:red'>this should be red</span>",
isActive: true,
classObj: {
active: false,
'text-danger': true
},
isActive: true,
error: null,
activeClass: 'active',
errorClass: 'text-danger',
activeColor: 'red',
fontSize: 30,
styleObject: {
color: 'red',
fontSize: '21px'
}
},
computed: {
classObj1: function () {
return {
active: this.isActive && !this.error,
'text-danger': this.error && this.error.type === 'fatal'
}
}
}
})
实例8：
<!-- 计算属性 -->
<div id="app8">
<div class="title">(8) app8-计算属性</div>
<p>Original msg:"{{message}}"</p>
<p>Computed reversed message:"{{reverseMessage}}"</p>
</div>
var app8 = new Vue({
el: '#app8',
data: {
message: 'ddd fff'
},
computed: {
// 计算属性的getter
reverseMessage: function () {
return this.message.split('').reverse().join('')
}
}
})
实例9：
<div id="app9">
<div class="title">(9) app9-watch</div>
{{fullName}}
</div>
var app9 = new Vue({
el: '#app9',
data: {
fName: 'ff',
lName: 'll',
// fullName:'ff ll'
},
// 可以选择watch监听可以选择computed计算属性，推荐计算属性
computed: {
fullName: function () {
return this.fName + ' ' + this.lName
}
},
watch: {
fName: function (val) {
this.fullName = val + ' ' + this.lastName
},
lName: function (val) {
this.fullName = this.fName + ' ' + val
}
}
})
实例10：
<div id="app10">
<div class="title">(10) app10-setter</div>
{{fullNames}}
</div>
var app10 = new Vue({
el: '#app10',
data: {
fNames: 'ff',
lNames: 'll',
// fullNames:'ff ll'
},
// 可以选择watch监听可以选择computed计算属性，推荐计算属性
computed: {
fullNames: {
get: function () {
return this.fNames + ' ' + this.lNames
},
set: function (newValue) {
var names = newValue.split(' ');
this.fNames = name[0];
this.lNames = names[names.length - 1];
}
}
}
})
实例11：
<div id="app11">
<div class="title">(11) app11-watch</div>
<p>
Ask a yes/no question:
<input v-model="question">
</p>
<p>{{ answer }}</p>
</div>
var app11 = new Vue({
el: '#app11',
data: {
question: '',
answer: 'i cannot give you an answer until you ask a question'
},
watch: {
question: function (newQuestion, oldQuestion) {
this.answer = 'waiting for you to stop typing...'
this.debouncedGetAnser()
}
},
created() {
this.debouncedGetAnser = _.debounce(this.getAnswer, 500)
},
methods: {
getAnswer: function () {
if (this.question.indexOf('?') === -1) {
this.answer = 'Questions usually contain a question mark. ;-)'
return
}
this.answer = 'thisingk...'
var vm = this
axios.get('https://yesno.wtf/api')
.then(function (response) {
vm.answer = _.capitalize(response.data.answer)
})
.catch(function (error) {
vm.answer = 'error ' + error
})
}
}
})
实例12：
<div id="app12">
<div class="title">(12) app12-v-for</div>
<ul>
<li v-for="item in items"> {{item.msg}} </li>
</ul>
<ul>
<!-- 唯一key -->
<li v-for="(item,index) in itemss" v-bind:key="index">{{parentMsg}} - {{index}} - {{item.msg}} </li>
</ul>
<div>计算属性computed-数组过滤或排序后的结果</div>
<ul>
<li v-for="n in evenNumbers">{{n}}</li>
</ul>
<div>methods-数组过滤或排序后的结果</div>
<ul>
<li v-for="n in even(numbers)">{{n}}</li>
</ul>
<div>将只渲染未完成的todo</div>
<ul>
<li v-for="todo in todos" v-if="!todo.isComplete">
{{todo}}
</li>
</ul>
</div>
var app12 = new Vue({
el: '#app12',
data: {
items: [
{ msg: 'fj' },
{ msg: 'fdss' }
],
parentMsg: 'parent',
itemss: [
{ msg: 'dssd' },
{ msg: 'dsdsde' }
],
numbers: [1, 2, 3, 4, 5],
todos: [
{ isComplete: true, value: '12' },
{ isComplete: false, value: '22' },
{ isComplete: false, value: '33' }
]
},
computed: {
evenNumbers: function () {
// filter过滤出能被2整除的元素
return this.numbers.filter(function (number) {
return number % 2 === 0
})
}
},
methods: {
even: function (numbers) {
return numbers.filter(function (number) {
return number % 2 === 0
})
}
}
})
实例13：
<div id="app13">
<div class="title">(13) app12-v-for-todo</div>
<form v-on:submit.prevent="addNewTodo">
<label>Add a todo</label>
<input v-model="newTodoText" id="new-todo" placeholder="E.G. Feed the cat">
<button>Add</button>
</form>
<ul>
<li is="todo-item" v-for="(todo,index) in todos" v-bind:key="todo.id" v-bind:title="todo.title"
v-on:remove="todos.splice(index,1)"></li>
</ul>
</div>
Vue.component('todo-item', {
template: `
<li>\
{{title}}\
<button v-on:click="$emit(\'remove\')">Remove</button>\
</li>\
`,
props: ['title']
})
var app13 = new Vue({
el: '#app13',
data: {
newTodoText: '',
todos: [
{
id: 1,
title: 'Do the dishes',
},
{
id: 2,
title: 'Take out the trash',
},
{
id: 3,
title: 'Mow the lawn'
}
],
nextTodoId:4
},
methods:{
addNewTodo:function(){
this.todos.push({
id:this.nextTodoId++,
title:this.newTodoText
})
this.newTodoText = ''
}
}
})