前置知识

 Vue 提供了 transition 的封装组件，在下列情形中，可以给任何元素和组件添加进入/离开过渡:

• 条件渲染 (使用 v-if)
• 条件展示 (使用 v-show)
• 动态组件
• 组件根节点

自定义 transition 过度效果，你需要对transition组件的name属性自定义。并在css中写入对应的样式

web 动画库-CSDN博客文章浏览阅读2次。动画领域有一个比较知名的CSS库：Animate.css，它提供了60多种动画，满足一般网页的需求，比如淡入淡出、闪现等等一系列日常动画，不过虽然它能满足日常需求，但是一些复杂的场景就需要靠JS手动去操作，比如界面滚动到某个元素才开始播放动画，比如拖拽、比如滚动界面时，动态调整元素就需要使用到GreenSockhttps://blog.csdn.net/qq_37550440/article/details/142390818?sharetype=blogdetail&sharerId=142390818&sharerefer=PC&sharesource=qq_37550440&spm=1011.2480.3001.8118

 安装依赖包

npm i @types/lodash lodash

npm i animate.css

npm i gsap

1.过渡的类名 name

在进入/离开的过渡中，会有 6 个 class 切换。

v-enter-from：定义进入过渡的开始状态。在元素被插入之前生效，在元素被插入之后的下一帧移除。

v-enter-active：定义进入过渡生效时的状态。在整个进入过渡的阶段中应用，在元素被插入之前生效，在过渡/动画完成之后移除。这个类可以被用来定义进入过渡的过程时间，延迟和曲线函数。

v-enter-to：定义进入过渡的结束状态。在元素被插入之后下一帧生效 (与此同时 v-enter-from 被移除)，在过渡/动画完成之后移除。

v-leave-from：定义离开过渡的开始状态。在离开过渡被触发时立刻生效，下一帧被移除。

v-leave-active：定义离开过渡生效时的状态。在整个离开过渡的阶段中应用，在离开过渡被触发时立刻生效，在过渡/动画完成之后移除。这个类可以被用来定义离开过渡的过程时间，延迟和曲线函数。

v-leave-to：离开过渡的结束状态。在离开过渡被触发之后下一帧生效 (与此同时 v-leave-from 被移除)，在过渡/动画完成之后移除。

<template><h2>transition name基础用法</h2><button @click="flag0 = !flag0">切换0</button><transition:duration="{ enter: 500, leave: 800 }"name="fade0"><div class="box" v-if="flag0"></div></transition>
</template><script setup lang="ts">
import { ref, reactive, watch } from "vue";
let flag0 = ref(false);
</script><style lang="less" scoped>
.box {width: 200px;height: 200px;background-color: pink;
}
// 切换0
//进入之前
.fade0-enter-from {width: 0px;height: 0px;
}
//进入过程
.fade0-enter-active {transition: all 2s ease;
}
// 最后一帧
.fade0-enter-to {//进入完成最好和box保持一致width: 200px;height: 200px;background: red;
}
.fade0-leave-from {//离开之前width: 200px;height: 200px;
}
.fade0-leave-active {//离开过程transition: all 3s linear;
}
.fade0-leave-to {//离开的最后一帧width: 0px;height: 0px;
}</style>

2.自定义过渡 class 类名

trasnsition props

• enter-from-class
• enter-active-class
• enter-to-class
• leave-from-class
• leave-active-class
• leave-to-class

<template><button @click="flag = !flag">切换1</button><h2>transition 自定义过渡 class 类名每个都对应一个类名,与name的区别是能结合第三方的内库使用</h2><transitionname="fade"enter-from-class="e-from"enter-active-class="e-active"enter-to-class="e-to"><div class="box" v-if="flag"></div></transition>
</template><script setup lang="ts">
import { ref, reactive, watch } from "vue";
let flag = ref(false);
</script><style lang="less" scoped>
// 切换1样式
.fade-enter-from, //进入之前
.e-from {width: 0px;height: 0px;
}
.fade-enter-active, //进入过度
.e-active {transition: all 2.5s ease;transform: rotate(360);
}.fade-enter-to, // 进入完成
.e-to {width: 200px;height: 200px;
}
.fade-leave-from {// 离开之前width: 200px;height: 200px;
}
.fade-leave-active {//离开过度transition: all 2.5s ease;transform: rotate(360);
}.fade-leave-to {// 离开完成width: 20px;height: 20px;
}
</style>

3 自定义class结合animate.css案例

<template>
<h2>transition 结合animate使用, 更丝滑</h2><button @click="flag2 = !flag2">animate切换2</button><transition:duration="{ enter: 500, leave: 800 }"leave-active-class="animate__animated animate__bounceInLeft"enter-active-class="animate__animated animate__bounceInRight"><div class="box" v-if="flag2"></div></transition>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
let flag2 = ref(false);
</script><style lang="less" scoped></style>

4.transition 生命周期8个

<template>
<h2>transition 的8个生命周期函数</h2><button @click="flag3 = !flag3">切换3</button><transition@before-enter="beforeEnter"@enter="enterActive"@after-enter="enterTo"@enter-cancelled="enterCancelled"@before-leave="beforeLeave"@leave="leaveActive"@after-leave="leaveTo"@leave-cancelled="leaveCancelled"><div class="box" v-if="flag3"></div></transition></template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
let flag0 = ref(false);let beforeEnter = (el: Element) => {//对应enter-fromconsole.log("进入之前", el);
};
let enterActive = (el: Element, done: Function) => {//对应enter-activeconsole.log("过度曲线");setTimeout(() => {done();}, 3000);
};
let enterTo = (el: Element) => {//对应enter-toconsole.log("进入完成");
};
let enterCancelled = () => {//多点击几次console.log("过度效果被打断");//显示过程被打断
};
let beforeLeave = () => {//对应leave-fromconsole.log("离开之前");
};
let leaveActive = (el: Element, done: Function) => {//对应enter-activemconsole.log("离开过度曲线");setTimeout(() => {done();}, 3000);
};
let leaveTo = () => {//对应leave-toconsole.log("离开完成");
};
let leaveCancelled = () => {//离开过度打断
};
</script><style lang="less" scoped></style>

5 transition生命周期与gsap结合使用案例

<template>
<h2>transition生命周期钩子函数 与gsap 结合案例 npm i gsap最健全的web动画库之一, 更丝滑</h2><button @click="flag4 = !flag4">gsap切换4</button><transition@before-enter="beforeEnter1"@enter="enter1"@leave="leave1"><div class="box" v-if="flag4"></div></transition></template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
let flag4 = ref(false);
let beforeEnter1 = (el: Element) => {gsap.set(el, {width: 0,height: 0,});
};
let enter1 = (el: Element, done: gsap.Callback) => {gsap.to(el, {width: 200,height: 200,onComplete: done,});
};
let leave1 = (el: Element, done: gsap.Callback) => {gsap.to(el, {width: 0,height: 0,onComplete: done,});
};
</script><style lang="less" scoped></style>

6 appear自动加载的动画可用于大屏使用

<template>
<h2>transition 之appear首次页面加载完成后的动画 案例</h2><transitionappearappear-from-class="appear-from"appear-active-class="appear-active"appear-to-class="appear-to"><div class="box"></div></transition><hr /></template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";</script><style lang="less" scoped>
.appear-from {width: 0;height: 0;
}
.appear-active {transition: all 2.5s ease;
}
.appear-to {width: 200px;height: 200px;
}
</style>

7 transition 之appear与结合animate使用 案例

<template><h2>transition 之appear与结合animate使用 案例</h2><transitionappearappear-active-class="animate__animated animate__bounceInRight"><div class="box"></div></transition>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
let flag0 = ref(false);
</script><style lang="less" scoped></style>

transition-group

8 transition-group过度列表

单个节点
多个节点，每次只渲染一个
那么怎么同时渲染整个列表，比如使用 v-for？在这种场景下，我们会使用 <transition-group> 组件。在我们深入例子之前，先了解关于这个组件的几个特点：

默认情况下，它不会渲染一个包裹元素，但是你可以通过 tag attribute 指定渲染一个元素。
过渡模式不可用，因为我们不再相互切换特有的元素。
内部元素总是需要提供唯一的 key attribute 值。
CSS 过渡的类将会应用在内部的元素中，而不是这个组/容器本身。

<template><h2>transition group使用</h2><button @click="add">add</button><button @click="pop">pop</button><div class="group_wraps"><transition-groupenter-active-class="animate__animated animate__bounceInRight"leave-active-class="animate__animated animate__bounceInLeft"><div v-for="(item, index) in list" :key="index">{{ item }}</div></transition-group></div>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
let flag0 = ref(false);
let list = reactive<number[]>([1, 2, 3, 4]);
let add = () => {list.push(list.length + 1);
};
let pop = () => {list.pop();
};
</script><style lang="less" scoped></style>

9 列表的(平移)移动过渡  move-class

<transition-group> 组件还有一个特殊之处。除了进入和离开，它还可以为定位的改变添加动画。只需了解新增的 v-move 类就可以使用这个新功能，它会应用在元素改变定位的过程中。像之前的类名一样，它的前缀可以通过 name attribute 来自定义，也可以通过 move-class attribute 手动设置

<template><h2>transition group（底层是aerotwist FLIP这个动画库实现的）列表过渡动画案例 平移过度move-class npm i @types/lodashlodash</h2><button @click="random">random</button><transition-grouptag="div"class="wraps"move-class="group_move"enter-active-class="animate__animated animate__bounceInRight"leave-active-class="animate__animated animate__bounceInLeft"><div class="item" v-for="item in data" :key="item.id">{{ item.number }}</div></transition-group>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";
//区别 new Array(81)得到的是[空属性（Empty attribute） × 81] 与 Array.apply(null,[1,2,3]) 第一个参数是this指向，第二个参数是数组
// ts检测到第二个参数不是数组我们要假装他是一个数组用as number[]
/*
list = ['a','b']
list.map((item,index)=>{ // 第一个参数是item,第二个是indexconsole.log(item) a ,bconsole.log(index) 0 ,1
})1%1 = 0
1%9 = 1
1%10 = 1*/
let data = ref(Array.apply(null, {length: 81,} as number[]).map((_, index) => {return {id: index, // 作为keynumber: (index % 9) + 1, // 从1开始  1-9*1-9的组合};})
);let random = () => {data.value = _.shuffle(data.value);
};let num = reactive({currentNum: 0,gsapNum: 0,
});watch(() => num.currentNum,(newVal) => {gsap.to(num, {duration: 1,gsapNum: newVal,});}
);
</script><style lang="less" scoped>
.wraps {display: flex;flex-wrap: wrap;width: calc(20px * 10 + 10px); // 整个父级的宽度,合理换行.item {width: 20px;height: 20px;border: 1px solid #ccc;list-style-type: none;display: flex;justify-content: center;align-items: center;}
}
.group_move {transition: all 0.8s ease;
}
</style>

10 状态过度 借助gsap库案例

<template><h2>状态过度 借助gsap库</h2><h3>Vue 也同样可以给数字 Svg 背景颜色等添加过度动画今天演示数字变化</h3><input v-model="num.currentNum" type="number" step="20" /><div>{{ num.gsapNum.toFixed(0) }}</div>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";let num = reactive({currentNum: 0,gsapNum: 0,
});watch(() => num.currentNum,(newVal) => {gsap.to(num, {duration: 1,gsapNum: newVal,});}
);
</script><style lang="less" scoped>
.wraps {display: flex;flex-wrap: wrap;width: calc(20px * 10 + 10px); // 整个父级的宽度,合理换行.item {width: 20px;height: 20px;border: 1px solid #ccc;list-style-type: none;display: flex;justify-content: center;align-items: center;}
}
.group_move {transition: all 0.8s ease;
}
</style>

完整实例代码

<template><h2>transition name基础用法</h2><button @click="flag0 = !flag0">切换0</button><transition:duration="{ enter: 500, leave: 800 }"name="fade0"><div class="box" v-if="flag0"></div></transition><hr /><button @click="flag = !flag">切换1</button><h2>transition 自定义过渡 class 类名每个都对应一个类名,与name的区别是能结合第三方的内库使用</h2><transitionname="fade"enter-from-class="e-from"enter-active-class="e-active"enter-to-class="e-to"><div class="box" v-if="flag"></div></transition><hr /><!--transition 结合animat使用  npm i animate.css  --><h2>transition 结合animate使用, 更丝滑</h2><button @click="flag2 = !flag2">animate切换2</button><transition:duration="{ enter: 500, leave: 800 }"leave-active-class="animate__animated animate__bounceInLeft"enter-active-class="animate__animated animate__bounceInRight"><div class="box" v-if="flag2"></div></transition><hr /><h2>transition 的8个生命周期函数</h2><button @click="flag3 = !flag3">切换3</button><transition@before-enter="beforeEnter"@enter="enterActive"@after-enter="enterTo"@enter-cancelled="enterCancelled"@before-leave="beforeLeave"@leave="leaveActive"@after-leave="leaveTo"@leave-cancelled="leaveCancelled"><div class="box" v-if="flag3"></div></transition><hr /><h2>transition生命周期钩子函数 与gsap 结合案例 npm i gsap最健全的web动画库之一, 更丝滑</h2><button @click="flag4 = !flag4">gsap切换4</button><transition@before-enter="beforeEnter1"@enter="enter1"@leave="leave1"><div class="box" v-if="flag4"></div></transition><hr /><h2>transition 之appear首次页面加载完成后的动画 案例</h2><transitionappearappear-from-class="appear-from"appear-active-class="appear-active"appear-to-class="appear-to"><div class="box"></div></transition><hr /><h2>transition 之appear与结合animate使用 案例</h2><transitionappearappear-active-class="animate__animated animate__bounceInRight"><div class="box"></div></transition><hr /><h2>transition group使用</h2><button @click="add">add</button><button @click="pop">pop</button><div class="group_wraps"><transition-groupenter-active-class="animate__animated animate__bounceInRight"leave-active-class="animate__animated animate__bounceInLeft"><div v-for="(item, index) in list" :key="index">{{ item }}</div></transition-group></div><hr /><h2>transition group（底层是aerotwist FLIP这个动画库实现的）列表过渡动画案例 平移过度move-class npm i @types/lodashlodash</h2><button @click="random">random</button><transition-grouptag="div"class="wraps"move-class="group_move"enter-active-class="animate__animated animate__bounceInRight"leave-active-class="animate__animated animate__bounceInLeft"><div class="item" v-for="item in data" :key="item.id">{{ item.number }}</div></transition-group><hr /><h2>状态过度 借助gsap库</h2><h3>Vue 也同样可以给数字 Svg 背景颜色等添加过度动画今天演示数字变化</h3><input v-model="num.currentNum" type="number" step="20" /><div>{{ num.gsapNum.toFixed(0) }}</div>
</template><script setup lang="ts">
import "animate.css";
import gsap from "gsap";
import _ from "lodash"; // 报错的话就需要安装ts的声明文件 Npm I @type/lodash -D
import { ref, reactive, watch } from "vue";let flag0 = ref(false);
let flag = ref(false);
let flag2 = ref(false);
let flag3 = ref(false);
let flag4 = ref(false);
let list = reactive<number[]>([1, 2, 3, 4]);//区别 new Array(81)得到的是[空属性（Empty attribute） × 81] 与 Array.apply(null,[1,2,3]) 第一个参数是this指向，第二个参数是数组
// ts检测到第二个参数不是数组我们要假装他是一个数组用as number[]
/*
list = ['a','b']
list.map((item,index)=>{ // 第一个参数是item,第二个是indexconsole.log(item) a ,bconsole.log(index) 0 ,1
})1%1 = 0
1%9 = 1
1%10 = 1*/
let data = ref(Array.apply(null, {length: 81,} as number[]).map((_, index) => {return {id: index, // 作为keynumber: (index % 9) + 1, // 从1开始  1-9*1-9的组合};})
);let random = () => {data.value = _.shuffle(data.value);
};let num = reactive({currentNum: 0,gsapNum: 0,
});watch(() => num.currentNum,(newVal) => {gsap.to(num, {duration: 1,gsapNum: newVal,});}
);let beforeEnter = (el: Element) => {//对应enter-fromconsole.log("进入之前", el);
};
let enterActive = (el: Element, done: Function) => {//对应enter-activeconsole.log("过度曲线");setTimeout(() => {done();}, 3000);
};
let enterTo = (el: Element) => {//对应enter-toconsole.log("进入完成");
};
let enterCancelled = () => {//多点击几次console.log("过度效果被打断");//显示过程被打断
};
let beforeLeave = () => {//对应leave-fromconsole.log("离开之前");
};
let leaveActive = (el: Element, done: Function) => {//对应enter-activemconsole.log("离开过度曲线");setTimeout(() => {done();}, 3000);
};
let leaveTo = () => {//对应leave-toconsole.log("离开完成");
};
let leaveCancelled = () => {//离开过度打断
};let beforeEnter1 = (el: Element) => {gsap.set(el, {width: 0,height: 0,});
};
let enter1 = (el: Element, done: gsap.Callback) => {gsap.to(el, {width: 200,height: 200,onComplete: done,});
};
let leave1 = (el: Element, done: gsap.Callback) => {gsap.to(el, {width: 0,height: 0,onComplete: done,});
};let add = () => {list.push(list.length + 1);
};
let pop = () => {list.pop();
};
</script><style lang="less" scoped>
.box {width: 200px;height: 200px;background-color: pink;
}
// 切换0
//进入之前
.fade0-enter-from {width: 0px;height: 0px;
}
//进入过程
.fade0-enter-active {transition: all 2s ease;
}
// 最后一帧
.fade0-enter-to {//进入完成最好和box保持一致width: 200px;height: 200px;background: red;
}
.fade0-leave-from {//离开之前width: 200px;height: 200px;
}
.fade0-leave-active {//离开过程transition: all 3s linear;
}
.fade0-leave-to {//离开的最后一帧width: 0px;height: 0px;
}
// 切换1样式
.fade-enter-from, //进入之前
.e-from {width: 0px;height: 0px;
}
.fade-enter-active, //进入过度
.e-active {transition: all 2.5s ease;transform: rotate(360);
}.fade-enter-to, // 进入完成
.e-to {width: 200px;height: 200px;
}
.fade-leave-from {// 离开之前width: 200px;height: 200px;
}
.fade-leave-active {//离开过度transition: all 2.5s ease;transform: rotate(360);
}.fade-leave-to {// 离开完成width: 20px;height: 20px;
}.appear-from {width: 0;height: 0;
}
.appear-active {transition: all 2.5s ease;
}
.appear-to {width: 200px;height: 200px;
}.wraps {display: flex;flex-wrap: wrap;width: calc(20px * 10 + 10px); // 整个父级的宽度,合理换行.item {width: 20px;height: 20px;border: 1px solid #ccc;list-style-type: none;display: flex;justify-content: center;align-items: center;}
}
.group_move {transition: all 0.8s ease;
}
</style>

15 跨组件通信依赖注入provide和inject-CSDN博客Provide / Inject通常，当我们需要从父组件向子组件传递数据时，我们使用 props。想象一下这样的结构：有一些深度嵌套的组件，而深层的子组件只需要父组件的部分内容。在这种情况下，如果仍然将 prop 沿着组件链逐级传递下去，可能会很麻烦。https://blog.csdn.net/qq_37550440/article/details/142491343?sharetype=blogdetail&sharerId=142491343&sharerefer=PC&sharesource=qq_37550440&spm=1011.2480.3001.8118