vue监听手机键盘搜索事件

<form action="javascript:return true">   <!-- form ios手机上唤起搜索按钮（默认是换行按钮）  -->
<input @keypress="searchBtn" type="search" name="" id="" value="" placeholder="医生" v-model="put" /> 
</form>
  searchBtn(event) { 
if (event.keyCode == 13) { //如果按的是enter键 13是enter 
event.preventDefault(); //禁止默认事件（默认是换行） 
console.log(event.target.value)
var search_val = event.target.value;
if(search_val == ''||search_val==null){
alert('搜索内容不能为空');
}else{
this.$router.push({path: '/doctorlist?keywords=' + search_val});
}
} 
}