动画——Vue中的动画封装

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）