<div id="app">
 <button @click="toshow">点击让子组件显示</button>
 <component v-bind:is="which_to_show"></component>
</div>
<script>
 var vm = new Vue({
 el: '#app',
 data: {
 which_to_show: "first"
 },
 methods: {
 toshow: function () { //切换组件显示
 var arr = ["first", "second", "third", ""];
 var index = arr.indexOf(this.which_to_show);
 if (index < 3) {
  this.which_to_show = arr[index + 1];
 } else {
  this.which_to_show = arr[0];
 }
 }
 },
 components: {
 first: { //第一个子组件
 template: "<div>这里是子组件1</div>"
 },
 second: { //第二个子组件
 template: "<div>这里是子组件2</div>"
 },
 third: { //第三个子组件
 template: "<div>这里是子组件3</div>"
 },
 }
 });
</script>

 <div id="app">
 <button @click="toshow">点击让子组件显示</button>
 <component v-bind:is="which_to_show" keep-alive></component>
</div>
<script>
 var vm = new Vue({
 el: '#app',
 data: {
 which_to_show: "first"
 },
 methods: {
 toshow: function () { //切换组件显示
 var arr = ["first", "second", "third", ""];
 var index = arr.indexOf(this.which_to_show);
 if (index < 3) {
  this.which_to_show = arr[index + 1];
 } else {
  this.which_to_show = arr[0];
 }
 console.log(this.$children);
 }
 },
 components: {
 first: { //第一个子组件
 template: "<div>这里是子组件1</div>"
 },
 second: { //第二个子组件
 template: "<div>这里是子组件2</div>"
 },
 third: { //第三个子组件
 template: "<div>这里是子组件3</div>"
 },
 }
 });
</script>

 <div id="app">
 <button @click="toshow">点击让子组件显示</button>
 <component v-bind:is="which_to_show"></component>
</div>
<script>
 var vm = new Vue({
 el: '#app',
 data: {
 which_to_show: "first"
 },
 methods: {
 toshow: function () { //切换组件显示
 var arr = ["first", "second", "third", ""];
 var index = arr.indexOf(this.which_to_show);
 if (index < 3) {
  this.which_to_show = arr[index + 1];
 } else {
  this.which_to_show = arr[0];
 }
 console.log(this.$children);
 }
 },
 components: {
 first: { //第一个子组件
 template: "<div>这里是子组件1</div>"
 },
 second: { //第二个子组件
 template: "<div>这里是子组件2，这里是ajax后的内容：{{hello}}</div>",
 data: function () {
  return {
  hello: ""
  }
 },
 activate: function (done) { //执行这个参数时，才会切换组件
  var self = this;
  $.get("/test", function (data) { //这个ajax我手动在服务器端设置延迟为2000ms，因此需要等待2秒后才会切换
  self.hello = data;
  done(); //ajax执行成功，切换组件
  })
 }
 },
 third: { //第三个子组件
 template: "<div>这里是子组件3</div>"
 }
 }
 });
</script>

<div id="app">
 <button @click="toshow">点击让子组件显示</button>
 <component v-bind:is="which_to_show" class="animated" transition="bounce" transition-mode="out-in"></component>
</div>
<script>
 Vue.transition("bounce", {
 enterClass: 'bounceInLeft',
 leaveClass: 'bounceOutRight'
 })
 var vm = new Vue({
 el: '#app',
 data: {
 which_to_show: "first"
 },
 methods: {
 toshow: function () { //切换组件显示
 var arr = ["first", "second", "third", ""];
 var index = arr.indexOf(this.which_to_show);
 if (index < 3) {
  this.which_to_show = arr[index + 1];
 } else {
  this.which_to_show = arr[0];
 }
 }
 },
 components: {
 first: { //第一个子组件
 template: "<div>这里是子组件1</div>"
 },
 second: { //第二个子组件
 template: "<div>这里是子组件2，这里是ajax后的内容：{{hello}}</div>",
 data: function () {
  return {
  hello: ""
  }
 }
 },
 third: { //第三个子组件
 template: "<div>这里是子组件3</div>"
 }
 }
 });
</script>