HTML+js+css实现点击图片弹出上传文件窗口的两种思路

第一种：CSS实现

<style>
<!--
.fileInputContainer{
height:256px;
background:url(upfile.png);
position:relative;
width: 256px;
}
.fileInput{
height:256px;
overflow: hidden;
font-size: 300px;
position:absolute;
right:0;
top:0;
opacity: 0;
filter:alpha(opacity=0);
cursor:pointer;
}
-->
</style> 
<div class="fileInputContainer"><input class="fileInput" id="" type="file" name=""></div>

[b]第二种：javascript实现[/b]

<div class="face">
<p><img class="normalFace" src="./images/upload.jpg" onclick="fileSelect();"></p>
<form id="form_face" enctype="multipart/form-data" style="width:auto;">
<input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();" style="display:none;">
</form>
</div>
<script type="text/javascript">
function fileSelect() {
document.getElementById("fileToUpload").click();
}

function fileSelected() {
// 文件选择后触发次函数
}
</script>