Vue 中的动画封装
功能：点击按钮，hello world 出现，再点击隐藏
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vue 中的动画封装</title>
<script src = './vue.js'></script>
<style>
.v-enter,.v-leave-to{
opacity:0;
}
.v-enter-active,.v-leave-active{
transition: opacity 1s;
}
</style>
</head>
<body>
<div id ='root'>
<transition>
<div v-show="show" >
hello world
</div>
</transition>
<button @click="handleBtnClick">toggle</button>
</div>
<script>
var vm = new Vue({
el:"#root",
data:{
show:false
},
methods:{
handleBtnClick:function(){
this.show = !this.show
}
}
})
</script>
</body>
</html>输出：点击--出现--隐藏
封装这个动画功能
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vue 中的动画封装</title>
<script src = './vue.js'></script>
<style>
.v-enter,.v-leave-to{
opacity:0;
}
.v-enter-active,.v-leave-active{
transition: opacity 1s;
}
</style>
</head>
<body>
<div id ='root'>
<fade :show="show"> //等于父组件的变量
<div>
hello world
</div>
</fade>
<button @click="handleBtnClick">toggle</button>
</div>
<script>
Vue.component('fade',{
props:['show'],
template:`
<transition>
<slot v-if="show"> </slot> //判断外部传来的DOM是否要被显示
</transition>
`
})
var vm = new Vue({
el:"#root",
data:{
show:false
},
methods:{
handleBtnClick:function(){
this.show = !this.show
}
}
})
</script>
</body>
</html>输出：点击--出现--隐藏
封装的好处：不需再设置动画样式，直接输入内容就好
<body>
<div id ='root'>
<fade :show="show">
<div>
hello world
</div>
</fade>
<fade :show="show">
<h1>
hello world
</h1>
</fade>
<button @click="handleBtnClick">toggle</button>
</div>输出：
可以将 样式 也封装进去，只能使用 JS 动画实现（推荐）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Vue 中的动画封装</title>
<script src = './vue.js'></script>
<!-- <style>
.v-enter,.v-leave-to{
opacity:0;
}
.v-enter-active,.v-leave-active{
transition: opacity 1s;
}
</style> -->
</head>
<body>
<div id ='root'>
<fade :show="show">
<div>
hello world
</div>
</fade>
<fade :show="show">
<h1>
hello world
</h1>
</fade>
<button @click="handleBtnClick">toggle</button>
</div>
<script>
Vue.component('fade',{
props:['show'],
template:`
<transition @before-enter="handleBeforeEnter"
@enter="handleEnter"
>
<slot v-if="show"> </slot>
</transition>
` ,
methods:{
handleBeforeEnter:function(el){
el.style.color = 'red'
},
handleEnter:function(el,done){
setTimeout(() =>{
el.style.color = 'green'
done()
},2000)
}
}
})
var vm = new Vue({
el:"#root",
data:{
show:false
},
methods:{
handleBtnClick:function(){
this.show = !this.show
}
}
})
</script>
</body>
</html>输出：点击---显示---2秒后变绿色（将样式都封装到 fade 组件里面，外部只需调用 fade 组件即可）
