基于Vue.js实现简单搜索框

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