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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