<!DOCTYPE html><html><head>    <title></title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <link rel="stylesheet" type="text/css" href="./animate.css">    <script src="./vue.js"></script>    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->    <style>        .myfade-enter, .v-leave-to {            opacity: 0;        }        .v-enter-active, .v-leave-active {            transition: opacity 1s;        }    </style></head><body>    <div id="root">        <transition name="myfade">            <div v-if="show">hello</div>            <div v-else>bye</div>        </transition>        <button @click="handleClick">切换</button>    </div>    <script type="text/javascript">        var vm = new Vue({            el: "#root",            data: {                show: true            },            methods: {                handleClick: function() {                    this.show = !this.show                }            }        });    </script></body></html>

(像上面这种加了style并不会实现渐变效果,因为vue默认是会尽量复用dom,想要vue不复用dom,要给其加上不同的key值)

加上不同key值后,渐变效果有了:

<!DOCTYPE html><html><head>    <title></title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <link rel="stylesheet" type="text/css" href="./animate.css">    <script src="./vue.js"></script>    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->    <style>        .myfade-enter, .myfade-leave-to {            opacity: 0;        }        .myfade-enter-active, .myfade-leave-active {            transition: opacity 1s;        }    </style></head><body>    <div id="root">        <transition name="myfade">            <div v-if="show" key="hello">hello</div>            <div v-else key="bye">bye</div>        </transition>        <button @click="handleClick">切换</button>    </div>    <script type="text/javascript">        var vm = new Vue({            el: "#root",            data: {                show: true            },            methods: {                handleClick: function() {                    this.show = !this.show                }            }        });    </script></body></html>

如果想设置多个属性之间的切换效果,可以用mode(mode="in-out":先显示要显示的再隐藏要隐藏的。mode="out-in":和前面的相反):

<!DOCTYPE html><html><head>    <title></title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <link rel="stylesheet" type="text/css" href="./animate.css">    <script src="./vue.js"></script>    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->    <style>        .myfade-enter, .myfade-leave-to {            opacity: 0;        }        .myfade-enter-active, .myfade-leave-active {            transition: opacity 1s;        }    </style></head><body>    <div id="root">        <transition name="myfade" mode="out-in">            <div v-if="show" key="hello">hello</div>            <div v-else key="bye">bye</div>        </transition>        <button @click="handleClick">切换</button>    </div>    <script type="text/javascript">        var vm = new Vue({            el: "#root",            data: {                show: true            },            methods: {                handleClick: function() {                    this.show = !this.show                }            }        });    </script></body></html>

组件动画也是可以的(不需要上面的不同值的key):

<!DOCTYPE html><html><head>    <title></title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <link rel="stylesheet" type="text/css" href="./animate.css">    <script src="./vue.js"></script>    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->    <style>        .myfade-enter, .myfade-leave-to {            opacity: 0;        }        .myfade-enter-active, .myfade-leave-active {            transition: opacity 1s;        }    </style></head><body>    <div id="root">        <transition name="myfade" mode="out-in">            <child1 v-if="show">hello</child1>            <child2 v-else>bye</child2>        </transition>        <button @click="handleClick">切换</button>    </div>    <script type="text/javascript">        Vue.component("child1", {            template: "<div>child1</div>"        });        Vue.component("child2", {            template: "<div>child2</div>"        });        var vm = new Vue({            el: "#root",            data: {                show: true            },            methods: {                handleClick: function() {                    this.show = !this.show                }            }        });    </script></body></html>

动态组件的实现方法:

<!DOCTYPE html><html><head>    <title></title>    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />    <link rel="stylesheet" type="text/css" href="./animate.css">    <script src="./vue.js"></script>    <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> -->    <style>        .myfade-enter, .myfade-leave-to {            opacity: 0;        }        .myfade-enter-active, .myfade-leave-active {            transition: opacity 1s;        }    </style></head><body>    <div id="root">        <transition name="myfade" mode="out-in">            //通过动态组件的方式实现:            <component :is="type"></component>        </transition>        <button @click="handleClick">切换</button>    </div>    <script type="text/javascript">        Vue.component("child1", {            template: "<div>child1</div>"        });        Vue.component("child2", {            template: "<div>child2</div>"        });        var vm = new Vue({            el: "#root",            data: {                type: "child1"            },            methods: {                handleClick: function() {                    this.type = this.type == "child1" ? "child2" : "child1"                }            }        });    </script></body></html>