Vue过渡动画—Vue学习笔记

要求:要通过Vue使用过渡动画我们要把需要过度的元素放在<transition name='变量名'></transition>中。

原理:通过在特定的时刻增加/移除样式实现。

一、Vue中的过度效果

1.未声明name,Vue默认添加/移除v-enter,v-leave-to,v-enter-active,v-leave-active来实现

v-enter决定元素在加入dom时的样式

v-enter-active决定样式执行状态

v-leave-to对应移除的

实例:为元素添加显示隐藏的过度效果

<style>
        .v-enter,.v-leave-to{
            opacity: 0;
        }
        .v-enter-active,.v-leave-active{
            transition: opacity 1s;
        }
    </style>
</head>
<body>
    <div id="app">
        <transition>
            <h3 v-if="show">Hi Boy</h3>
        </transition>
        <button @click="handleClick">DoIt</button>
    </div>
</body>
<script>

    var app=new Vue({
        el:'#app',
        data:{
            show:true
        },
        methods:{
            handleClick:function(){
            this.show=!this.show
            }
        }
    })
</script>

2.如果声明了对应的name则可以改写为

css:

<style>
        .fade-enter,.fade-leave-to{
            opacity: 0;
        }
        .fade-enter-active,.fade-leave-active{
            transition: opacity 1s;
        }
    </style>

html:

<div id="app">
        <transition name="fade">
            <h3 v-if="show">Hi Boy</h3>
        </transition>
        <button @click="handleClick">DoIt</button>
    </div>

 

二、Vue中的动画效果

1.使用自定义动画

html不变,关键是css变为如下

@keyframes myfade{
        from{opacity: 0}
        to{opacity: 1}
    }
        .fade-enter-active{
            animation: myfade 1s;
        }
        .fade-leave-active{
            animation: myfade 1s reverse;
        }

实现效果一样,此时我们用的动画,当然动画还有很多效果。

2.采用Animate.css库文件实现动画

使用库文件时我们需要知道除了通过那么调用的另一种调用方法

直接在class中自定义调用的样式

css:

@keyframes myfade{
        from{opacity: 0}
        to{opacity: 1}
    }
        .enter{
            animation: myfade 1s;
        }
        .leave{
            animation: myfade 1s reverse;
        }

html:

<transition name="fade"
            enter-active-class="enter"
            leave-active-class="leave"
        >
            <h3 v-if="show">Hi Boy</h3>
        </transition>

此时的enter和leave时我们完全自定义的样式名。

如果向调用animate.css库只需要改写html

如下:

<transition name="fade"
        enter-active-class="animated bounce"
        leave-active-class="animated bounce"
        >
            <h3 v-if="show">Hi Boy</h3>
        </transition>

bounce未调用的动画名。提示前面必须加animated。

具体想要使用什么动画请看animate.css官网

提示:如果想要在页面初始化时播放动画需要添加appear和appear-active-class

<transition name="fade"
        appear
        enter-active-class="animated shake"
        leave-active-class="animated bounce"
        appear-active-class="animated shake"
        >
            <h3 v-if="show">Hi Boy</h3>
        </transition>

三、过度效果和动画效果混用

例子如下:

<style>
    @keyframes myfade{
        from{opacity: 0}
        to{opacity: 1}
    }
        .fade-enter,.fade-leave-to{
            opacity: 0;
        }
        .fade-enter-active,.fade-leave-active{
            transition: opacity 3s;
        }
    </style>
</head>
<body>
    <div id="app">
        <transition name="fade"
                    appear
                    enter-active-class="animated shake fade-enter-active"
                    leave-active-class="animated bounce fade-leave-active"
                    appear-active-class="animated shake"
        >
            <h3 v-if="show">Hi Boy</h3>
        </transition>
        <button @click="handleClick">DoIt</button>
    </div>
</body>

警告:此时opacity过渡动画是3秒,animate.css动画未1秒,执行时间不统一。

解决方法:添加type属性如

type="transition" 以过度效果执行时间执行

type="animation"以动画效果执行时间执行

<transition name="fade" type="transition"
                    appear
                    enter-active-class="animated shake fade-enter-active"
                    leave-active-class="animated bounce fade-leave-active"
                    appear-active-class="animated shake"
        >

2.自定义动画时间

:duration="时长(毫秒)"一般定义

:duration="{enter:1000,leave:2000}"//分别定义出场和入场时长

<transition name="fade" :duration="10000"
                    appear
                    enter-active-class="animated shake fade-enter-active"
                    leave-active-class="animated bounce fade-leave-active"
                    appear-active-class="animated shake"
        >
            <h3 v-if="show">Hi Boy</h3>
        </transition>

 

posted @ 2019-01-29 17:09  本该如此  阅读(677)  评论(0编辑  收藏  举报