动画——Vue中的动画封装

封装动画让代码可复用

如下是一个简单的点击渐变、渐隐：

    
    
    
    
    
    
        /*因为没有给它命名，所以用默认v开头的class名*/
        .v-enter, .v-leave-to {
            opacity: 0;
        }
        .v-enter-active, .v-leave-active {
            transition: opacity 1s;
        }
    


    
        //性能考虑，尽量不用index作为key值 

        
            hello

                 toggle     

             var vm = new Vue({             el: "#root",             data: {                 show: true             },             methods: {                 handBtnClick: function() {                     this.show = !this.show                 }             }         });     

封装后：

    
    
    
    
    
    
        /*因为没有给它命名，所以用默认v开头的class名*/
        .v-enter, .v-leave-to {
            opacity: 0;
        }
        .v-enter-active, .v-leave-active {
            transition: opacity 1s;
        }
    


    
        
            
hello world
        
        
            
hello world
        
        toggle
    

             Vue.component("fade", {             props: ["show"],             template: `                                                                    `         });         var vm = new Vue({             el: "#root",             data: {                 show: true             },             methods: {                 handBtnClick: function() {                     this.show = !this.show                 }             }         });     

其实css也可以封装：可以不用css动画，而用js动画：

    
    
    
    
    
    
        /*因为没有给它命名，所以用默认v开头的class名*/
        .v-enter, .v-leave-to {
            opacity: 0;
        }
        .v-enter-active, .v-leave-active {
            transition: opacity 1s;
        }
    


    
        
            
hello world
        
        
            
hello world
        
        toggle
    

             Vue.component("fade", {             props: ["show"],             template: `                                                                    `,             methods: {                 handleBeforeEnter: function(el) {                     el.style.color = "red"                 },                 handleEnter: function(el, done) {                     setTimeout(()=>{                         el.style.color = "green"                         done() //再次注意：要记得done()                     }, 1000)                 }             }         });         var vm = new Vue({             el: "#root",             data: {                 show: true             },             methods: {                 handBtnClick: function() {                     this.show = !this.show                 }             }         });     

（这种封装可以完整的将css、js、html都封装在一个组件中。推荐）