0.main.js引入animate.css
1.給router-view標簽外層加上transition標簽，並且router-view標簽要改成<router-view></router-view>
2.在transition標簽加上兩個類：enter-active-class 和 leave-active-class
<transition enter-active-class="animated bounce" leave-active-class="animated hinge"> <router-view></router-view> </transition>