<ul>

    <li id="0">冬瓜很好吃</li>

    <li id="1">西瓜不好吃</li>

    <li id="2">南瓜很好吃</li>

    <li id="3">苦瓜很好吃</li>

    <li id="4">傻瓜怎么吃</li>

    <li id="5">冬天的瓜很好吃</li>

</ul>

<input type="text" onkeyup="finds(this.value)">

<script type="text/javascript">

    var s="";

    function finds(v){

        if(v!=s&&v!=""){

            $("li").css("color","#000");

            $("li:contains('"+v+"')").css("color","red");

        s=v;

        }

    }

</script>