vue实现百度下拉框

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>百度下拉框</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
.gray{
background: #ccc;
}
</style>
<script src="vue.js"></script>
<script src="vue-resource.js"></script>
<script>
window.onload=function(){
new Vue({
el:'body',
data:{
myData:[],
t1:'',
now:-1
},
methods:{
get:function(ev){
if(ev.keyCode==38 || ev.keyCode==40)return;

if(ev.keyCode==13){
window.open('https://www.baidu.com/s?wd='+this.t1);
this.t1='';
}

this.$http.jsonp('https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su',{
wd:this.t1
},{
jsonp:'cb'
}).then(function(res){
this.myData=res.data.s;
},function(){

});
},
changeDown:function(){
this.now++;
if(this.now==this.myData.length)this.now=-1;
this.t1=this.myData[this.now];
},
changeUp:function(){
this.now--;
if(this.now==-2)this.now=this.myData.length-1;
this.t1=this.myData[this.now];
}
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="text" v-model="t1" @keyup="get($event)" @keydown.down="changeDown()" @keydown.up.prevent="changeUp()">
<ul>
<li v-for="value in myData" :class="{gray:$index==now}">
{{value}}
</li>
</ul>
<p v-show="myData.length==0">暂无数据...</p>
</div>
</body>
</html>