JS动画与Velocity.js的结合

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<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Vue使用Velocity.js</title>
    <script src="./vue.js"></script>
</head>
<body>
    <div id="root">
        <transition 
            name="fade"
            @before-enter="handleBeforeEnter"
            @enter="handleEnter"
            @after-enter="handleAfterEnter"
        >
            <div v-if="show">
                hello world
            </div>
        </transition>   
        <button @click="handleClick">切换</button>
    </div> 
    <script>
    new Vue({ 
        el: "#root", 
        data: {
            show: true
        },
        methods: {
            handleClick: function() {
                this.show = !this.show
            },
            handleBeforeEnter: function(el) {
                el.style.color = 'red'
            },
            handleEnter: function(el, done) {
                setTimeout(() => {
                    el.style.color = 'green';
                }, 2000)
                setTimeout(() => {
                    done()
                }, 4000)
            },
            handleAfterEnter: function(el) {
                el.style.color = 'black'
            }
        }
    })
    </script>
</body>
</html>

http://www.velocityjs.org/

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<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Vue使用Velocity.js</title>
    <script src="./vue.js"></script>
    <script src="./velocity.js"></script>
</head>
<body>
    <div id="root">
        <transition 
            name="fade"
            @before-enter="handleBeforeEnter"
            @enter="handleEnter"
            @after-enter="handleAfterEnter"
        >
            <div v-if="show">
                hello world
            </div>
        </transition>   
        <button @click="handleClick">切换</button>
    </div> 
    <script>
    new Vue({ 
        el: "#root", 
        data: {
            show: true
        },
        methods: {
            handleClick: function() {
                this.show = !this.show
            },
            handleBeforeEnter: function(el) {
                el.style.opacity = 0;
            },
            handleEnter: function(el, done) {
                Velocity(el, {
                    opacity: 1
                }, {
                    duration: 1000,
                    complete: done
                })
            },
            handleAfterEnter: function(el) {
                console.log('动画结束')
            }
        }
    })
    </script>
</body>
</html>