html：
<div class="form-group"> <label class="col-sm-3 col-sm-6 control-label">图片</label> <span class="problem-must"> </span> <div class="col-sm-8"> <a class="fb-upload" href="javascript:void(0);"> <input class="form-control" name="pic" type="file" accept=".gif,.jpg,.png,.jpeg" /> <span class="fb-img">上传图片</span> </a> </div> </div>
css:
.form-group input[type="file"] {
cursor: pointer;
opacity: 0;
position: absolute;
top: 0;
}
.fb-img {
border: 1px solid #ccc;
border-radius: 4px;
box-shadow: 0 1px 1px rgba(0, 0, 0, 0.075) inset;
color: gray;
display: inline-block;
height: 34px;
line-height: 1.42857;
padding: 6px 12px;
text-align: left;
transition: border-color 0.15s ease-in-out 0s, box-shadow 0.15s ease-in-out 0s;
width: 100%;
}
