<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<style>
*{ margin:0; padding:0; list-style:none;}
#box{ width:645px; margin:10px auto; text-align:center; overflow:hidden; font-size:20px;}
#box img{ width:270px; height:129px;}
#t1{ width:540px; height:36px; line-height:36px; outline:none; text-indent:6px; font-size:20px;}
.s_btn {
outline:none;
width: 100px;
height: 40px;
float:right;
color: rgb(255, 255, 255);
font-size: 15px;
letter-spacing: 1px;
background: rgb(51, 133, 255);
border-bottom: 1px solid rgb(45, 120, 244);
-webkit-appearance: none;
border:none;
-webkit-border-radius: 0;
margin-left:1px;
cursor:pointer;
}
#box ul{ width:542px; border:1px solid #ccc; border-top:none; text-align:left; text-indent:6px; display:none;}
#box ul li{ height:30px; line-height:30px; cursor:default;}
#box ul li.on{ background:#f0f0f0;}
</style>
<script src="jquery-1.7.2.js"></script>
<script>
$(function(){
var oBox=$('#box');
var oBtn=$('#btn1');
var oTxt=$('#t1');
var oUl=$('#ul1');
var iNow=-1;
var oldValue='';
var url='https://sp0.baidu.com/5a1Fazu8AA54nxGko9WTAnF6hhy/su';
oTxt.on('keyup',function(ev){
if(ev.keyCode==38||ev.keyCode==40){
return;
}
if(ev.keyCode==13){
window.open('https://www.baidu.com/s?wd='+oTxt.val(),'_self');
oTxt.val('');
}
$.ajax({
url:url,
data:{
wd:oTxt.val()
},
dataType:'jsonp',
jsonp:'cb',
timeout:5000,
success:function(json){
var arr=json.s;
if(arr.length){
oUl.css('display','block');
}else{
oUl.css('display','none');
}
oUl.html('');
$.each(arr,function(index){
var oLi=document.createElement('li');
$(oLi).html(arr[index]);
$(oLi).appendTo(oUl);
$(oLi).on('mouseover',function(){
$.each(oUl.children(),function(t){
oUl.children().eq(t).removeClass('on');
});
$(this).addClass('on');
});
$(oLi).on('mouseout',function(){
$.each(oUl.children(),function(t){
oUl.children().eq(t).removeClass('on');
});
});
$(oLi).on('click',function(){
window.open('https://www.baidu.com/s?wd='+$(this).html(),'_self');
oTxt.val('');
});
});
},
error:function(){
alert('网络异常，请重新输入');
}
});
oldValue=oTxt.val();
});
oBtn.on('click',function(){
window.open('https://www.baidu.com/s?wd='+oTxt.val(),'_self');
oTxt.val('');
});
oTxt.on('keydown',function(ev){
var aLi=$('li');
switch(ev.keyCode){
case 40:
iNow++;
if(iNow==aLi.length){iNow=-1};
$.each(aLi,function(index){
aLi.eq(index).removeClass('on');
});
if(iNow==-1){
oTxt.val(oldValue);
}else{
aLi.eq(iNow).addClass('on');
oTxt.val(aLi.eq(iNow).html());
}
break;
case 38:
iNow--;
if(iNow==-2){iNow=aLi.length-1};
$.each(aLi,function(index){
aLi.eq(index).removeClass('on');
});
if(iNow==-1){
oTxt.val(oldValue);
}else{
aLi.eq(iNow).addClass('on');
oTxt.val(aLi.eq(iNow).html());
}
break;
}
});
});
</script>
</head>
<body>
<div id="box">
<img src="https://www.baidu.com/img/bd_logo1.png"><br>
<input type="text" id="t1"><input type="submit" id="btn1" value="百度一下" class="bg s_btn">
<ul id="ul1">
<!--<li class="on">1111</li>-->
<!--<li>1111</li>-->
<!--<li>1111</li>-->
<!--<li>1111</li>-->
</ul>
</div>
</body>
</html>
