看到一些网站上添加了各种搜索引擎。如Google、百度、360、有道等，就有点好奇，这个怎么实现？研究了一各个搜索引擎怎么传送关键字，找到了小窍门，于是乎，自家弄了一个百家搜索：

效果：

演示地址戳此：http://sousuodaquan.sinaapp.com/

ps：在列表中添加了糯米汇（http://www.nuomihui.com）的站内搜索，仅用于演示，别无它用，特此声明。

HTML代码：

<div class="sdiv"><form id="sform" method="get" target="_blank" action="http://www.baidu.com/s"><div class="mains"><ul id="selectul"><li id="selectedli" style="background-color: white;">百度</li><li>百度</li><li>谷歌</li><li>必应</li><li>有道</li><li>搜搜</li><li>搜狗</li><li>360</li><li>爱淘宝</li><li>亚马逊</li><li>当当</li><li>知道</li><li>维基</li><li>Crea</li><li class="lastli">糯米汇</li></ul><input type="text" name="wd" id="findParam"/></div><input type="submit" value="搜索" id="btn" /></form><h4 style="margin-left:100px">出处：<a href="http://www.ido321.com/" target="_blank">淡忘~浅思</a></h4></div>

JavaScript：

window.onload = function(){            var selectul = document.getElementById('selectul');            var lis = selectul.getElementsByTagName('li');            var selectedli = document.getElementById('selectedli');            var findParam = document.getElementById('findParam');            var sform = document.getElementById("sform");            var lislen = lis.length;            for (var i = 0; i < lislen; i++) {lis[i].onmouseover=function(){selectul.style.overflow = "visible";};lis[i].onmouseout=function(){selectul.style.overflow = "hidden";};lis[i].onclick = function(){selectedli.innerHTML = this.innerHTML;                    switch(this.innerHTML){                        case "百度":findParam.name='wd';sform.action = "http://www.baidu.com/s";                             break;                        case "谷歌":findParam.name='q';sform.action = "http://www.google.com.hk/search";                             break;                        case "必应":findParam.name='q';sform.action = "http://cn.bing.com/search";                             break;                        case "有道":findParam.name='query';sform.action = "http://www.sogou.com/web";                             break;                        case "搜搜":findParam.name='w';sform.action = "http://www.soso.com/q";                             break;                        case "搜狗":findParam.name='q';sform.action = "http://www.youdao.com/search";                             break;                        case "360":findParam.name='q';sform.action = "http://www.youdao.com/search";                             break;                        case "爱淘宝":findParam.name='key';sform.action = "http://ai.taobao.com/search/index.htm";                             break;                         case "亚马逊":findParam.name='field-keywords';sform.action = "http://www.amazon.cn/s/ref=nb_sb_noss";                             break;                         case "当当":findParam.name='key';sform.action = "http://search.dangdang.com/";                             break;                         case "知道":findParam.name='word';sform.action = "http://zhidao.baidu.com/search";                             break;                         case "维基":findParam.name='search';sform.action = "ttp://zh.wikipedia.org/w/index.php";                             break;                         case "Crea":findParam.name='q';sform.action = "http://search.creativecommons.org/";                             break;                         case "糯米汇":findParam.name='s';sform.action = "http://www.nuomihui.com/";                             break;}selectul.style.overflow = "hidden";};    };};

原文首发： http://www.ido321.com/1143.html