使用transition标签实现：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum=1.0,minimum=1.0,user-scalable=0" />
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/vue@2.6.1.js"></script>
<style>
.leftNav {
height: 90vh;
width: 200px;
background-color: #ccc;
}
/*设置动画*/
.fade-enter,
.fade-leave-to {
transform: translateX(-100%);
}
.fade-enter-active,
.fade-leave-active {
transition: 1s;
}
.fade-enter-to {
transform: translateX(0)
}
</style>
</head>
<body>
<div id="app">
<button @click="show = !show">{{txt}}</button>
<transition name="fade">
<div class="leftNav" v-show="show">左侧边栏</div>
</transition>
</div>
<script>
var Main =
{
data() {
return {
show: true,
}
},
computed: {
txt() {
return this.show ? '收起' : '展开'
}
},
}
var Ctor = Vue.extend(Main)
new Ctor().$mount("#app")
</script>
</body>
</html>
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