“未捕获的TypeError：无法读取未定义的属性'activeElement'”

Question

<input placeholder="Search Box" v-model="origin" type="text">

mounted(){
var input = this.origin;
var searchBox = new google.maps.places.SearchBox(input);

searchBox.addListener('places_changed', function() {
  var places = searchBox.getPlaces();
});
},

有什么东西我不见了？ 我还在index.html上添加了我的api

<script src="https://maps.googleapis.com/maps/api/js?key=xxx&libraries=places"></script>