input type=file输入框

<div class="row">

<!--选择图片按钮-->

<div class="col-xs-12" align="center" id="view">

<img id="upload_img" src="img/enroll/upload-btn.png" style="width: 254px;height: 246px;" />

<input id="file" type="file" class="inputstyle" accept="image/*" />

</div>

</div>

<style>

.inputstyle {

width: 250px;

height: 250px;

position: relative;

cursor: pointer;

outline: medium none;

filter: alpha(opacity=0);

-moz-opacity: 0;

opacity: 0;

top: -80%;

left: 10px;

}

</style>