1. js版

<input style="visibility:hidden" id="upload" type="file" name="xxx" οnchange="var a=this.value;alert(a);document.getElementById('uploadname').innerHTML=a;" />

<a id="uploadname" href="javascript:document.getElementById('upload').click();">上传</a>

2. jquery 版本

<!--jquery 版-->

<input type="file"  id="jqupload" />

<a id="uploadimg" >jquery上传</a>

<script type="text/javascript" src="Scripts/jquery-1.6.1.min.js"></script>

<script type="text/javascript">

    $(function () {

        $("#jqupload").change(function () {

            var v = $(this).val();

            alert(v);

        })

        $("#uploadimg").click(function () {

            $("#jqupload").click();

        })

    })

</script>