<html> <head> <script src='js/vue.js'></script> </head> <body> <div id="example"> <select v-model='city'> <option value='西安'>西安</option> <option value='洛阳'>洛阳</option> <option value='南京'>南京</option> <option value='北京'>北京</option> </select> <span>欲望都市：{ {city}}</span> </div>