<!DOCTYPE html>
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<link rel="stylesheet" href="bootstrap/bootstrap.css">
<link rel="stylesheet" href="bootstrap/bootstrap-theme.css">
<script src="bootstrap/jquery-1.10.2.js"></script>
<script src="bootstrap/bootstrap.js"></script>
<style>
.fileinput-button {
position: relative;
display: inline-block;
overflow: hidden;
}
.fileinput-button input{
position:absolute;
right: 0px;
top: 0px;
opacity: 0;
-ms-filter: 'alpha(opacity=0)';
font-size: 200px;
}
</style>
</head>
<body style="padding: 10px">
<div align="center">
<span class="btn btn-success fileinput-button">
<span>上传</span>
<input type="file">
</span>
</div>
</body>
</html>