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35.复习-实现小球动画.html
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35.复习-实现小球动画.html
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<!DOCTYPE html>
<html lang="en">
<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">
<script src="./lib/vue.js"></script>
<title>Document</title>
<style>
.ball{
background-color: red;
width: 15px;
height: 15px;
border-radius: 50%;
}
</style>
</head>
<body>
<div id="app">
<input type="button" value="加入购物车" @click="flag=!flag">
<transition
@before-enter="beforeEnter"
@enter="enter"
@after-enter="afterEnter">
<div class="ball" v-show="flag"></div>
</transition>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
flag:false,
},
methods: {
beforeEnter(el){
el.style.transform= 'translate(0,0)'
},
enter(el, done){
el.offsetWidth
el.style.transform = 'translate(150px,450px)'
el.style.transition = 'all 1s ease'
done()
},
afterEnter(el){
//这句话第一个功能是公职小球的显示与隐藏
//第二个功能，直接跳过后半场 ，让flag标识符直接变为false
//当第二次再点击按钮的时候 flag= flase -> true
//也就做到了每次只进行上半段
this.flag=!this.flag
/*Vue 把一个完整的动画，使用钩子函数拆分为两个部分
我们使用flag标识符，来表示动画的切换
上半场flag= flase -> true
下半场flag= true -> false
*/
}
},
})
</script>
</body>
</html>