问题描述：想做一个上传文件的功能，但是用了html5的<input type="file">发现不是很美观。而bootstrap本身没有找到一些美观的样式。于是找到了一个小插件，还算比较符合直男的审美。
解决方案：小插件的名字叫做bootstrap-fileinput(https://github.com/kartik-v/bootstrap-fileinput/)
使用方法：
1、下载相应的zip或者tar包解压到相应的目录。
2、在<head>引用相应的文件。官网给的例子如下，改成本地路径即可（当然也可自定义选择）：
<!-- bootstrap 4.x is supported. You can also use the bootstrap css 3.3.x versions -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" crossorigin="anonymous">
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/css/fileinput.min.css" media="all" rel="stylesheet" type="text/css" />
<!-- if using RTL (Right-To-Left) orientation, load the RTL CSS file after fileinput.css by uncommenting below -->
<!-- link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/css/fileinput-rtl.min.css" media="all" rel="stylesheet" type="text/css" /-->
<!-- the font awesome icon library if using with `fas` theme (or Bootstrap 4.x). Note that default icons used in the plugin are glyphicons that are bundled only with Bootstrap 3.x. -->
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.5.0/css/all.css" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.3.1.min.js" crossorigin="anonymous"></script>
<!-- piexif.min.js is needed for auto orienting image files OR when restoring exif data in resized images and when you
wish to resize images before upload. This must be loaded before fileinput.min.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/js/plugins/piexif.min.js" type="text/javascript"></script>
<!-- sortable.min.js is only needed if you wish to sort / rearrange files in initial preview.
This must be loaded before fileinput.min.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/js/plugins/sortable.min.js" type="text/javascript"></script>
<!-- purify.min.js is only needed if you wish to purify HTML content in your preview for
HTML files. This must be loaded before fileinput.min.js -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/js/plugins/purify.min.js" type="text/javascript"></script>
<!-- bootstrap.min.js below is needed if you wish to zoom and preview file content in a detail modal
dialog. bootstrap 4.x is supported. You can also use the bootstrap js 3.3.x versions. -->
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.bundle.min.js" crossorigin="anonymous"></script>
<!-- the main fileinput plugin file -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/js/fileinput.min.js"></script>
<!-- following theme script is needed to use the Font Awesome 5.x theme (`fas`) -->
< script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/themes/fas/theme.min.js"></script -->
<!-- optionally if you need translation for your language then include the locale file as mentioned below (replace LANG.js with your language locale) -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.5.1/js/locales/LANG.js"></script>
3、写一段js，主要作用就是初始化fileinput插件。这里的#input-id就是相应<input>标签的id
// initialize with defaults
$("#input-id").fileinput();
// with plugin options
$("#input-id").fileinput({'showUpload':false, 'previewFileType':'any'});
4、<input>标签
<input id="input-id" type="file" class="file" data-preview-file-type="text">
5、效果
小demo，可以自动预览
参考文献：
GitHub - kartik-v/bootstrap-fileinput: An enhanced HTML 5 file input for Bootstrap 3.x with file preview, multiple selection, and more features.
Bootstrap File Input - © Kartik
关于bootstrap对控件input type ="file"的美化 - Red's blog - CSDN博客
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