JavaScript实现百度搜索框效果

*{margin: 0;padding: 0;}
body,html{width: 100%;height: 636px;background: url('../img/bj2.jpg') no-repeat;background-size:100% 100% }
.nav{width: 100%;height: 32px;background:rgba(0,0,0,0.3);padding-right:20px;padding-left:20px;box-sizing: border-box }
.nav .left{list-style: none;float: left}
.nav .left li{color:white;line-height: 32px;margin-right: 12px;font-size: 13px;float: left;}
.nav .left li a{color:white;}
.nav .left li a:hover{cursor: pointer}
.nav .right{list-style: none;float: right;}
.nav .right li a{color:white;line-height: 32px;margin-left: 12px;font-size: 13px;opacity:1;}
.nav .right li{float: left;}
#logo{margin: 0px auto;display: block;}
.baidu_box{width: 646px;height: 44px;margin:0 auto;position: relative;margin-top: 20px; }
.baidu_box #seek{height: 40px;width: 538px;float: left;text-indent: 0.6em;font-size: 16px;}
.baidu_box #baidu{width: 104px;height: 44px;float: left;line-height: 44px;font-size:16px;text-align: center;background: url('../img/an_bg.jpg') no-repeat;background-size: 100% 100%;}
.baidu_box #baidu:hover{cursor: pointer}
.baidu_box .icon{position: absolute;top: 12px;left: 490px;}
.baidu_box .icon:hover{cursor: pointer}
.baidu_box ul{width: 541px;float: left;display: none;}
.baidu_box ul p{width: 542px;line-height: 40px;list-style: none;display: none;text-indent: 0.6em;background: white}
.baidu_box ul p:hover{cursor: pointer;background: url('../img/an_bg.jpg') no-repeat;background-size: 100% 100%;}
.buttom{margin: 0 auto;width: 500px;height: 40px;margin-top:210px;}
.buttom li {list-style: none;float: left;margin-left: 20px;}
.buttom li a {line-height: 40px;color: #525252;}

//百度搜索框
var baidu = document.getElementById('baidu'); //获取百度按钮名字
var seekArray = new Array (); //创建新数组;用来存放用户上一次搜索的问题
var seek = document.getElementById('seek'); //获取百度搜索框
var p = document.getElementsByTagName('p'); //获取下拉标签
baidu.onclick = baiDu;//给百度按钮创建onclick事件
function baiDu(){
 var seeked = seek.value; //获取用户在搜索框中搜索的内容
 if((seeked != seekArray[0]) && (seeked != seekArray[1])){ //判断数组内不能出现重复的值，若重复则不能添加到数组中
 seekArray.unshift(seeked); //将用户添加的内容放入到新创建的内数组中
 }
 seekArray.length = 3;  //将数组的长度定死为3 ;即显示搜索框显示的内容就是为3
 for(var x=0;x<seekArray.length;x++){ //将数组中的东西放入到我们的搜索框下菜单中
 if((seekArray[x] != undefined)){ //判断用户上次搜索的东西，假如为空就不显示
  p[x].innerHTML = seekArray[x];
 }
 }
}

//搜索框获焦/失焦的状态
seek.onfocus = function(){
 for(var x of p){
 x.style.display = 'block';
 }
 p[0].parentNode.style.display = 'block'; //
}
seek.onblur = function(){
 p[0].parentNode.style.display = 'none';
 for(var x of p){
 x.style.display = 'none';
 }
}
seek.onkeydown = function(Ent){
 // console.log(baiDu);
 if(Ent.keyCode == 13){ //当在input框中敲回车的时候
 baiDu();  //触发baiDu()
 }
}

//点击用户搜索过的新闻搜索框直接显示
for(var x of p){
 x.onmouseover = look ; //遍历所有的li并且给每个li添加鼠标悬浮事件
}
function look(){
 seek.value = this.innerHTML;
}

//获取当前时间
function dates(){
 var now = document.getElementById('sj');
 var time = new Date;
 var hour = time.getHours();
 var mins = time.getMinutes();
 if(parseInt(mins)<10){
 mins = '0'+mins;
 }
 now.innerHTML = hour +':'+mins;
}

//点击换背景
var bg = document.getElementById('bg');//获取id为dg的标签
bg.onclick = function bgImg(){  //给他添加点击事件
 var bo = document.getElementById('bo'); //获取body
 var i = parseInt(Math.random()*7);  //写个随机数字
 bo.setAttribute("style","background:url('img/bj"+(i+1)+".jpg') no-repeat;background-size:100% 100%");//更改他的样式
}