利用js 进行输入框自动匹配字符的小例子

<p><span style="font-size: 18px; ">输入框自动匹配字符~</span></p><p><span style="font-size: 18px; ">但是遇到一个问题~所有匹配的字符要事先写好~大概如果是大型网站的话~应该是利用数据库的记录吧</span></p><p><span style="font-size: 18px; ">看代码</span></p>

<style>
ul,li{margin: 0; padding: 0;width:100%;}
</style>
<script language="javascript" type="text/javascript">
function checkword()
{
   var wordvalue=document.getElementById("word").value.toLowerCase();
   var alltxt="all|big|cut|car|daph8|eeg|egg|eat|fuck|fuck you|fix|good|hand|hidden|ill|jack|jad|kevin|long|man|number|oio|part|pp|quit|QQ|rest|reg|set|submit|time|tag|uuzo|view|windows|want|xy|xun|young|yuyu|z|David|David|哈哈|";//这里就是你所想要匹配的字符，可惜只能用于小型的论坛
   var alltxtalltxtpp=alltxt.toLowerCase();
   var alltxtalltxt_xiang=alltxt.split("|");
   var alltxt_xiang1=alltxtpp.split("|");
   var inhtml="<ul>"
   var isyou=0;
   for (i=0;i<alltxt_xiang1.length;i++)
   {
       if (alltxt_xiang1[i].substr(0,wordvalue.length)==wordvalue)
       {
           inhtmlinhtml=inhtml+"<li onclick="document.getElementById('word').value=this.innerHTML;document.getElementById('showmenu').style.display='none';" onmouseover="this.style.backgroundColor='#666666'" onmouseout="this.style.backgroundColor=''">"+alltxt_xiang[i]+"</li>";
           isyou=1;
       }
   }
   inhtmlinhtml=inhtml+"</ul>";
   if (isyou==1)
   {
       document.getElementById("showmenu").innerHTML=inhtml;
       document.getElementById("showmenu").style.display="";
   }
   else
   {
       document.getElementById("showmenu").innerHTML="";
       document.getElementById("showmenu").style.display="none";
   }
   if (wordvalue=="")
   {
       document.getElementById("showmenu").innerHTML="";
       document.getElementById("showmenu").style.display="none";
   }
}
</script>
<input type="text" name="word" size="20" id="word" onkeyup="checkword()" style="border:1px solid #666666;width:200px;height:25px;">
<div style="position: absolute; width: 200px; height: 100px; z-index: 1; left: 10px; top: 40px;border:1px solid #666666;display:none;" id="showmenu"></div>