<div id="app">
 <logo-picture></logo-picture>
 <search-panel></search-panel>
</div>

//js还要实例#app
var app = new Vue({
 el: "#app"
})

Vue.component('logo-picture',{
 template :' \
 <div class="main-logo">\
 <img :src="items[now].src" @click="toggleFlag"/>\
 <span @click="toggleFlag" class="logoList-arrow"> </span>\
 <transition-group tag="ul" v-show="flagShow" class="logoList">\
  <li v-for="(item,index) in items" :key="index" @click="changeFlag(index)" @mouseover="flagHover(index)" :class="{selectback: index == hoverindex}">\
  <img :src="item.src" />\
  </li>\
 </transition>\
 </div>',
 data: function() {
 return {
  items: [{src:'../src/assets/360_logo.png'},{src:'../src/assets/baidu_logo.png'},{src:'../src/assets/sougou_logo.png'}],
  now: 0,
  flagShow: false,
  hoverindex: -1 
 }
 },
 methods: {
 //显示隐藏图片列表
 toggleFlag: function() {
  this.flagShow = !this.flagShow;
 },
 //改变搜索引擎
 changeFlag: function(index) {
  this.now = index;
  this.flagShow = false;
  bus.$emit("change",index);
 },
 //li hover
 flagHover: function(index) {
  this.hoverindex = index;
 }   
 }
});

Vue.component('search-panel',{
 template:'\
 <div class="search-input">\
 <input v-model="search" @keyup="get($event)" @keydown.enter="searchInput()" @keydown.down="selectDown()" @keydown.up.prevent="selectUp()"/>\
 <span @click="clearInput()" class="search-reset">×</span>\
 <button @click="searchInput()" class="search-btn">搜一下</button>\
 <div class="search-select">\
  <transition-group tag="ul" mode="out-in">\
  <li v-for="(value,index) in myData" :class="{selectback:index==now}" :key="index" @click="searchThis" @mouseover="selectHover(index)" class="search-select-option search-select-list">\
   {{value}}\
  </li>\
  </transition-group>\
 </div>\
 </div>',
 data: function() {
 return {
  search: '',
  myData: [],
  flag: 0,
  now: -1,
  logoData: [
  {
   'name': "360搜索",
   searchSrc: "https://www.so.com/s?ie=utf-8&shb=1&src=360sou_newhome&q="
  },
  {
   'name': "百度搜索",
   searchSrc: "https://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd="
  },
  {
   'name': "搜狗搜索",
   searchSrc: "https://www.sogou.com/web?query="
  }
  ]
 }
 },
 methods: {
 get: function(event) {
  if(event.keyCode == 38 || event.keyCode == 40){ //向上向下
  return ;
  }
  this.$http.jsonp('https://sug.so.360.cn/suggest?word=' + this.search + '&encodein=utf-8&encodeout=utf-8').then(function(res) {
  this.myData = res.data.s;

  }, function() {

  });
 },
 //清除内容
 clearInput: function() {
  this.search = '';
  this.get();
 },
 //搜索
 searchInput: function() {
  alert(this.flag)
  window.open(this.logoData[this.flag].searchSrc+this.search);
 },
 //搜索的内容
 searchThis: function(index) {
  this.search = this.myData[index];
  this.searchInput();
 },
 //li hover
 selectHover: function(index) {
  this.search = this.myData[index];
  this.now = index;
 },
 //向下
 selectDown: function() {
  this.now++;
  if(this.now == this.myData.length) {
  this.now = 0;
  }
  this.search = this.myData[this.now];
 },
 //向上
 selectUp: function() {
  this.now--;
  if(this.now == -1) {
  this.now = this.myData.length - 1;
  }
  this.search = this.myData[this.now];
 }
 },
 created: function() { //通信
 var self = this;
 bus.$on('change',function(index) {
  self.flag = index;
 })
 }
})

var bus = new Vue();

//logo-picture里触发事件，并传递参数
bus.$emit("change",index);

//search-panel里监听事件是否发生
var self = this;
bus.$on('change',function(index) {
 self.flag = index;
})