vue 組件中使用 transition 和 transition-group實(shí)現(xiàn)過渡動畫

// 單個(gè)元素
 <transition name="自定義名字">
 <p v-if="show">hello</p>
 </transition>
 // 列表元素: 注意group的直接子元素是v-for渲染出來的
 <ul class="list">
 <transition-group name="list">
 <li v-for="(item, index) in gameList" :key="item.id">
 <app-horizontal :itemData="item"></app-horizontal>
 </li>
 </transition-group>
 </ul>

 .name-enter
 {
 opacity: 0;
 transform: translateY(30px)
 }

 .name-enter-active {
 transition: all .3s;
 }

 .name-enter-to {
 opacity: 1;
 transform: translateY(0);
 }

 .name-enter-active:nth-child(3n+1) {
 transition-delay: 0s;
 }
 .name-enter-active:nth-child(3n+2) {
 transition-delay: .1s;
 }
 .name-enter-active:nth-child(3n+3) {
 transition-delay: .2s;
 }

// 例如實(shí)現(xiàn)上述列表依次顯示
 <ul class="list">
 <transition-group
 v-bind:css="false"
 v-on:before-enter="beforeEnter"
 v-on:enter="enter"
 v-on:after-enter="afterEnter">
 <li v-for="(item, index) in gameList" 
 :key="item.id" 
 :data-delay="index*100" 
 >
 <app-horizontal :itemData="item"></app-horizontal>
 </li>
 </transition-group>
 </ul> 
 // 
 methods: {
 // 事先定義上述類名
 // 在beforeEnter enter afterEnter 鉤子中手動操作上述類名
 
 // 初始態(tài)
 beforeEnter(dom) {
 dom.classList.add('list-enter', 'list-enter-active');
 },
 // 中間態(tài)
 enter(dom,done) {
 // 通過 setTimeout + dataset 實(shí)現(xiàn)過渡
 let delay = dom.dataset.delay;
 setTimeout(function () {
 dom.classList.remove('list-enter');
 dom.classList.add('list-enter-to');
 //監(jiān)聽 transitionend 事件
 var transitionend = window.ontransitionend ? "transitionend" : "webkitTransitionEnd";
 dom.addEventListener(transitionend, function onEnd() {
 // 移除事件
 dom.removeEventListener(transitionend, onEnd);
 //調(diào)用done(),表示動畫已完成
 done()
 });
 }, delay)
 },
 // 終止態(tài)
 afterEnter(dom) {
 dom.classList.remove('list-enter-to', 'list-enter-active');
 }
 }

<ul class="list">
 <transition-group
 v-bind:css="false"
 v-on:before-enter="beforeEnter"
 v-on:enter="enter"
 v-on:after-enter="afterEnter">
 <li v-for="(item, index) in gameList" 
 :key="item.id" 
 :data-delay="index*100"
 data-y = "100%" 
 >
 <app-horizontal :itemData="item"></app-horizontal>
 </li>
 </transition-group>
 </ul> 
 // 對應(yīng)的操作方法; 添加自定義的 dataset,給dom設(shè)置css樣式;根據(jù)需求添加
 methods: {
 // 初始態(tài)
 beforeEnter(dom) {
 let { x = 0, y = 0, opacity = 0 } = dom.dataset;
 dom.style.cssText = `transition: .3s;opacity: ${opacity};transform: translateX(${x}) translateY(${y});`;
 },
 // 中間態(tài)
 enter(dom,done) {
 let delay = dom.dataset.delay;
 setTimeout(function () {
 dom.style.cssText = `transition: .3s;opacity: 1;transform: translateX(0) translateY(0);`;
 //監(jiān)聽 transitionend 事件
 var transitionend = window.ontransitionend ? "transitionend" : "webkitTransitionEnd";
 dom.addEventListener(transitionend, function onEnd() {
 dom.removeEventListener(transitionend, onEnd);
 done(); 
 });
 }, delay)
 },
 // 終止態(tài)
 afterEnter(dom) {
 dom.style.cssText = "";
 }
 }

webkit-animation動畫有三個(gè)事件：
 開始事件: webkitAnimationStart
 結(jié)束事件: webkitAnimationEnd
 重復(fù)運(yùn)動事件: webkitAnimationIteration
css3的過渡屬性transition: 一個(gè)事件
 過渡結(jié)束: webkitTransitionEnd