js控制 点一下增加一个输入框，点一下增加一个输入框……

<div>
    <div>
        附件1：<input type="file" id="file1" name="file1" />
        <a href="javascript:void(0)" class="easyui-linkbutton" iconCls="icon-add" onclick="addFile(document.getElementById('filesDiv').innerHTML)"">更多附件</a>
    </div>
    <div id="filesDiv"></div>
</div>

<script type="text/javascript">

    var i =2;
    function addFile(param){
        param += "<div>附件"+i+"：<input type='file' id='file"+i+"'"+" name='file"+i+"'"+"/>&nbsp;&nbsp;"+"</div>";
        document.getElementById("filesDiv").innerHTML = param;
        i=i+1;
    }

</script>    

效果图：