(尚014)Vue过渡与动画

操作元素时有个过渡或动画的效果(渐变和移动的效果和放大缩小的效果)

过渡:trasition

动画:animation

1.vue动画的理解

1)操作css的trasition或animation(它本身不是传动画)

2)vue会给目标添加/移除特定的class

3)过渡相关的类名

　　xxx-enter-active:制定显示的transition

　　xxx-leave-acttive:指定隐藏的transition

　　xxx-enter/xxx-leave-to:指定隐藏式的样式

1.test014(1).html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*显示/隐藏时的过渡效果*/
        .xxx-enter-active,.xxx-leave-active{
            transition: opacity 1s;
        }
        /*隐藏时的样式*/
        .xxx-enter,.xxx-leave-to{
            opacity: 0;
        }

        /*显示时的过渡效果*/
        /*改变多个时写all,然后再指定*/
        .move-enter-active{
            transition: all 1s;
        }
        /*隐藏时的过渡效果*/
        .move-leave-active{
            transition: all 3s;
        }
        /*隐藏时的样式*/
        .move-enter,.move-leave-to{
            opacity: 0;
            /*在水平方向移动,向右边移动,所以是正值20px*/
            transform: translateX(20px);
        }
    </style>
</head>
<body>
<div id="test1">
    <button @click="isShow=!isShow">toggle</button>
    <transition name="xxx">
        <p v-show="isShow">hello</p>
    </transition>
</div>

<div id="test2">
    <button @click="isShow=!isShow">toggle</button>
    <transition name="move">
        <p v-show="isShow">hello</p>
    </transition>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
    new Vue({
        el:'#test1',
        data(){
            return{
                isShow:true
            }
        }
    })

    new Vue({
        el:'#test2',
        data(){
            return{
                isShow:true
            }
        }
    })
</script>
</body>
</html>
2.test014(2).html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        /*进入过程动画*/
        .bounce-enter-active{
            animation: bounce-in .5s;
        }
        /*离开过程动画*/
        .bouce-leave-active{
            /*reverse反过来*/
            animation: bounce-in .5s reverse;
        }
        /*具体使用哪个animation*/
        @keyframes bounce-in {
            /*x%为时间;scale(1.5),1.5为放大1.5倍;*/
            0%{
                transform:scale(0);
            }
            50%{
                transform:scale(1.5);
            }
            100%{
                transform:scale(1);
            }
        }
    </style>
</head>
<body>
<div id="example-2">
    <button @click="show=!show">Toggle show</button>
    <br>
    <transition name="bounce">
        <!--display: inline-block不加这个会占一整行,加了就会缩小至当前文字-->
        <p v-if="show" style="background: red;display: inline-block">吾乃常山赵子龙也!!!</p>
    </transition>
</div>

<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
    new Vue({
        el:'#example-2',
        data:{
            show:true
        }
    })
</script>
</body>
</html>

3.总结:

基本过渡动画的编码步骤:

1)在目标元素外包裹<transition name="xxx">

2)定义class样式

指定过渡样式transition

指定隐藏时样式:opacity/其他