搜题功能在此网站没有存在的必要，但是搜索功能还是很有必要记录学习。

<button style="float:right;margin-left:3px;margin-right:8px;margin-top: 1px;" onclick="soti();">搜索</button>
<input style="width:170px;float:right;margin-right:8px;"  type="text" id="soti" placeholder=" 搜索题目" onkeydown="keyup_submit(event);">

 <script>
function keyup_submit(e){ 
    //回车键触发搜题
var evt = window.event || e; 
  if (evt.keyCode == 13){
document.getElementById("next").style.display="none";
var str=document.getElementById("soti").value;
souti(str);
 }
 }

function souti(str)
{
    if (str=="")
    { document.getElementById("soti").innerHTML="";
        return;
     } 
    if (window.XMLHttpRequest)
    {xmlhttp=new XMLHttpRequest();}
    xmlhttp.onreadystatechange=function()
    {
        if (xmlhttp.readyState==4 && xmlhttp.status==200)
        {document.getElementById("timu").innerHTML=xmlhttp.responseText; }
    }
    xmlhttp.open("POST","so.php",true);
   xmlhttp.setRequestHeader("Content-type","application/     x-www-form-urlencoded");
  xmlhttp.send("soti="+str);
}
</script>

php核心代码

if ($_SERVER["REQUEST_METHOD"] == "POST") {
   $soti = test_input($_POST["soti"]);}
$result = mysql_query("SELECT * FROM xingce_panduan where timu like '%$soti%'");