目标效果：
toggle.gif
加上v-show后的效果：
toggle1.gif
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="vue.min.js"></script>
<style>
.test {
width: 200px;
height: 200px;
background-color: coral;
transition: height 0.5s linear 0s;
}
.test.show {
height: 100px;
transition: height 0.5s linear 0s;
}
</style>
</head>
<body>
<div id="app">
<button @click="toggle">切换</button>
<div class="test" v-show="show" :class="show ? 'show' : ''">
</div>
</div>
<script>
let app = new Vue({
el: "#app",
data: {
show: false
},
methods: {
toggle() {
this.show = !this.show
},
}
})
</script>
</body>
</html>
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