<input type="file" id="choosefile" style=""/>
<div onclick="uploadfile()" style="width:78px;height:50px;margin-left:5px;background:#00A2D4;float:left;display:block;line-height:50px;text-align:center;color:white;border-radius:3px;cursor:pointer;">选择文件</div>
<div id="filename" style="line-height:70px"></div>
<script type="text/javascript">
function uploadfile(){
    $("#choosefile").click();
    //jquery获取input file文件名
    var file = $("#choosefile").val();
    var fileName = getFileName(file);
    function getFileName(o){
        var pos=o.lastIndexOf("\\");
        return o.substring(pos+1);  
    $("#filename").html(fileName);
</script>