封装动画让代码可复用
如下是一个简单的点击渐变、渐隐：
<!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="./animate.css"> <script src="./vue.js"></script> <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> --> <style type="text/css"> /*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; } </style> </head> <body> <div id="root"> //性能考虑，尽量不用index作为key值 <br> <transition> <div v-show="show">hello</div> </transition> <button @click="handBtnClick">toggle</button> </div> <script type="text/javascript"> var vm = new Vue({ el: "#root", data: { show: true }, methods: { handBtnClick: function() { this.show = !this.show } } }); </script> </body> </html>
封装后：
<!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="./animate.css"> <script src="./vue.js"></script> <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> --> <style type="text/css"> /*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; } </style> </head> <body> <div id="root"> <fade :show="show"> <div>hello world</div> </fade> <fade :show="show"> <h2>hello world</h2> </fade> <button @click="handBtnClick">toggle</button> </div> <script type="text/javascript"> Vue.component("fade", { props: ["show"], template: ` <transition> <slot v-if="show"></slot> </transition> ` }); var vm = new Vue({ el: "#root", data: { show: true }, methods: { handBtnClick: function() { this.show = !this.show } } }); </script> </body> </html>其实css也可以封装：可以不用css动画，而用js动画：
<!DOCTYPE html> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link rel="stylesheet" type="text/css" href="./animate.css"> <script src="./vue.js"></script> <!-- <script src="http://cdn.staticfile.org/vue/2.6.10/vue.common.dev.js"></script> --> <style type="text/css"> /*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; } </style> </head> <body> <div id="root"> <fade :show="show"> <div>hello world</div> </fade> <fade :show="show"> <h2>hello world</h2> </fade> <button @click="handBtnClick">toggle</button> </div> <script type="text/javascript"> Vue.component("fade", { props: ["show"], template: ` <transition @before-enter="handleBeforeEnter" @enter="handleEnter"> <slot v-if="show"></slot> </transition> `, 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 } } }); </script> </body> </html>（这种封装可以完整的将css、js、html都封装在一个组件中。推荐）
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