废话不多说了，直接给大家贴代码了，具体代码如下所述：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<style>
#search ul {
list-style-type: none;
display: block;
width: 100px;
height: 33px;
margin: 0;
padding: 0;
border: 0px;
float: left;
}
#search li {
border: 0px;
margin: 0px;
padding: 0px;
}
#search .selected {
display: block;
}
#search form {
margin: 0px;
padding: 0px;
}
#search input {
height: 30px;
width: 400px;
margin: 0px;
}
#search .button {
font-size: 17px;
font-weight: 600;
color: #002D96;
height: 30px;
width: 110px;
margin-left: 50px;
background: #e6efc2;
opacity: 0.8;
border: #7fb80e 1px solid;
cursor: pointer;
-webkit-border-radius: 2px;
border-radius: 2px;
}
</style>
</head>
<body>
<div id="search" align="center">
<table>
<tr>
<td>
<ul>
<li style="display:block;"><img width="80" src="https://www.baidu.com/img/bd_logo1.png"/></li>
<li style="display:none;"><img width="80" src="https://www.google.com.hk/images/branding/googlelogo/2x/googlelogo_color_120x44dp.png"/></li>
<li style="display:none;"><img width="80" src="https://www.sogou.com/images/logo2014/error180x60.png"/></li>
</ul>
</td>
<td id="from_box" style="padding-left:10px;">
<form id="from_baidu" style="display:block" action="http://www.baidu.com/baidu" target="_blank" method="get">
<input name="" type="hidden" value="baidu"/>
<input type="text" name="word"/>
<input class="button" type="submit" value="百度一下" onMouseOver="this.style.opacity='1'" onMouseOut="this.style.opacity='0.7'"/>
</form>
<form id="from_google" style="display:none" action="http://www.google.com/search" target="_blank" method="get">
<input type="text" name="q"/>
<input class="button" type="submit" value="google搜索" onMouseOver="this.style.opacity='1'" onMouseOut="this.style.opacity='0.7'"/>
</form>
<form id="from_sougou" style="display:none" action="http://www.sogou.com/web" target="_blank" name="sogou_queryform">
<input type="text" name="query">
<input class="button" type="submit" value="sougou搜索" onMouseOver="this.style.opacity='1'" onMouseOut="this.style.opacity='0.7'"/>
</form>
</td>
</tr>
</table>
</div>
<script>
var search = document.getElementById("search");
var formbox = document.getElementById('from_box');
var forms = formbox.getElementsByTagName("form");
var ul = search.getElementsByTagName("ul")[0];
var li = ul.getElementsByTagName("li");
var length = li.length;
li[0].onclick = function() {
for(var i = 1; i < length; i++) {
li[i].style.display = "block";
}
}
var n = 0; //第一个显示表单的位置
for(var i = 1; i < length; i++) {
li[i].onclick = function(a) {
return function() {
//交换显示的html内容
var temp = li[0].innerHTML;
li[0].innerHTML = this.innerHTML;
this.innerHTML = temp;
for(var j = 1; j < length; j++) {
li[j].style.display ="none";
}
//交换表单的显示
//alert(li[0].innerHTML.substring(37,7));
//alert(li[0].innerHTML.indexOf('baidu'));
hidden_from(); //隐藏表单
if(li[0].innerHTML.indexOf('baidu') > 0) {
document.getElementById('from_baidu').style.display = 'block';
} else if(li[0].innerHTML.indexOf('google') > 0) {
document.getElementById('from_google').style.display = 'block';
} else if(li[0].innerHTML.indexOf('sougou') > 0) {
document.getElementById('from_sougou').style.display = 'block';
}
//alert(this.innerHTML);
//forms[n].style.display = "none";
//forms[a].style.display = "block";
//n = a;
}
}(i);
li[i].onmouseover = function() {
this.style.border ="#7fb80e 1px solid";
this.style.background ="#f2eada";
}
li[i].onmouseout = function() {
this.style.border = "0px";
this.style.background = "inherit";
}
}
//隐藏搜索框表单的函数
function hidden_from() {
for(var j = 0; j < forms.length; j++) {
forms[j].style.display = "none";
}
}
</script>
</body>
</html>
以上所述是小编给大家介绍的JavaScript切换搜索引擎的导航网页搜索框实例代码，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
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