监视属性
- 天气案例
- 天气案例_监视属性
- 天气案例_深度监视
- 添加案例_监视属性_简写
天气案例
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>天气案例title>
<script type="text/javascript" src="../js/vue.js">script>
head>
<body>
<div id="root">
<h2>今天天气很{{info}}h2>
<button @click="changeWeather">切换天气button>
div>
body>
<script type="text/javascript">
Vue.config.productionTip = false
const vm = new Vue({
el:'#root',
data:{
isHot:true,
},
computed:{
info(){
return this.isHot ? '炎热' : '凉爽'
}
},
methods: {
changeWeather(){
this.isHot = !this.isHot
}
},
})
script>
html>
天气案例_监视属性
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>天气案例_监视属性title>
<script type="text/javascript" src="../js/vue.js">script>
head>
<body>
<div id="root">
<h2>今天天气很{{info}}h2>
<button @click="changeWeather">切换天气button>
div>
body>
<script type="text/javascript">
Vue.config.productionTip = false
const vm = new Vue({
el:'#root',
data:{
isHot:true,
},
computed:{
info(){
return this.isHot ? '炎热' : '凉爽'
}
},
methods: {
changeWeather(){
this.isHot = !this.isHot
}
},
})
vm.$watch('isHot',{
immediate:true,
handler(newValue,oldValue){
console.log('isHot被修改了',newValue,oldValue)
}
})
script>
html>
天气案例_深度监视
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>天气案例_深度监视title>
<script type="text/javascript" src="../js/vue.js">script>
head>
<body>
<div id="root">
<h2>今天天气很{{info}}h2>
<button @click="changeWeather">切换天气button>
<hr/>
<h3>a的值是:{{numbers.a}}h3>
<button @click="numbers.a++">点我让a+1button>
<h3>b的值是:{{numbers.b}}h3>
<button @click="numbers.b++">点我让b+1button>
<button @click="numbers = {a:666,b:888}">彻底替换掉numbersbutton>
{{numbers.c.d.e}}
div>
body>
<script type="text/javascript">
Vue.config.productionTip = false
const vm = new Vue({
el:'#root',
data:{
isHot:true,
numbers:{
a:1,
b:1,
c:{
d:{
e:100
}
}
}
},
computed:{
info(){
return this.isHot ? '炎热' : '凉爽'
}
},
methods: {
changeWeather(){
this.isHot = !this.isHot
}
},
watch:{
isHot:{
handler(newValue,oldValue){
console.log('isHot被修改了',newValue,oldValue)
}
},
numbers:{
deep:true,
handler(){
console.log('numbers改变了')
}
}
}
})
script>
html>
添加案例_监视属性_简写
DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>天气案例_监视属性_简写title>
<script type="text/javascript" src="../js/vue.js">script>
head>
<body>
<div id="root">
<h2>今天天气很{{info}}h2>
<button @click="changeWeather">切换天气button>
div>
body>
<script type="text/javascript">
Vue.config.productionTip = false
const vm = new Vue({
el:'#root',
data:{
isHot:true,
},
computed:{
info(){
return this.isHot ? '炎热' : '凉爽'
}
},
methods: {
changeWeather(){
this.isHot = !this.isHot
}
},
watch:{
}
})
script>
html>
