input file限制上传文件类型的方法

在前端html中，上传文件时，一般都是用到 type 属性值为 file 的 input 标签，但在默认情况下，file 类型的 input 标签是不限制选择本地文件的类型的。

input file 代码

<input type="file" name="Files" />

默认情况下，input file标签 选择本地文件时，是不受限制的，可以选择压缩包类型文件，文本类型文件，图片类型文件等。

input accept属性介绍

accept：此属性只能与 <input type="file"> 配合使用。它规定能够上传的文件类型

语法：

<input type="file" accept="value">

参数：

value：可选，具体参考文未的值

input file 只允许图片类型上传

1、只允许图片类型文件上传

设置accept 属性的值为 "image/*" ,只允许图片类型的文件上传

<!--只允许图片类型文件-->
<input type="file" name="Files" accept="image/*" />

2、只允许单一类型的图片文件上传

html代码：

<!--只允许jpg类型的图片文件-->
<input type="file" name="Files" accept="image/jpeg" />

input file 其它示例

html代码

<!--只允许文本文件-->
<input type="file" name="Files" accept="text/plain" />
<!--只允许png类型的图片文件-->
<input type="file" name="Files" accept="image/png" />
<!--只允许zip类型的压缩包文件-->
<input type="file" name="Files" accept="aplication/zip" />
<!--只允许PPT类型的文件-->
<input type="file" name="Files" accept="application/vnd.ms-powerpoint" />

input file accept属性部份值介绍

文件类型	accept 属性值
*.3gpp	audio/3gpp, video/3gpp	3GPP Audio/Video
*.ac3	audio/ac3	AC3 Audio
*.asf	allpication/vnd.ms-asf	Advanced Streaming Format
*.au	audio/basic	AU Audio
*.css	text/css	Cascading Style Sheets
*.csv	text/csv	Comma Separated Values
*.doc	application/msword	MS Word Document
*.dot	application/msword	MS Word Template
*.dtd	application/xml-dtd	Document Type Definition
*.dwg	image/vnd.dwg	AutoCAD Drawing Database
*.dxf	image/vnd.dxf	AutoCAD Drawing Interchange Format
*.gif	image/gif	Graphic Interchange Format
*.htm	text/html	HyperText Markup Language
*.html	text/html	HyperText Markup Language
*.jp2	image/jp2	JPEG-2000
*.jpe	image/jpeg	JPEG
*.jpeg	image/jpeg	JPEG
*.jpg	image/jpeg	JPEG
*.js	text/javascript, application/javascript	JavaScript
*.json	application/json	JavaScript Object Notation
*.mp2	audio/mpeg, video/mpeg	MPEG Audio/Video Stream, Layer II
*.mp3	audio/mpeg	MPEG Audio Stream, Layer III
*.mp4	audio/mp4, video/mp4	MPEG-4 Audio/Video
*.mpeg	video/mpeg	MPEG Video Stream, Layer II
*.mpg	video/mpeg	MPEG Video Stream, Layer II
*.mpp	application/vnd.ms-project	MS Project Project
*.ogg	application/ogg, audio/ogg	Ogg Vorbis
*.pdf	application/pdf	Portable Document Format
*.png	image/png	Portable Network Graphics
*.pot	application/vnd.ms-powerpoint	MS PowerPoint Template
*.pps	application/vnd.ms-powerpoint	MS PowerPoint Slideshow
*.ppt	application/vnd.ms-powerpoint	MS PowerPoint Presentation
*.rtf	application/rtf, text/rtf	Rich Text Format
*.svf	image/vnd.svf	Simple Vector Format
*.tif	image/tiff	Tagged Image Format File
*.tiff	image/tiff	Tagged Image Format File
*.txt	text/plain	Plain Text
*.wdb	application/vnd.ms-works	MS Works Database
*.wps	application/vnd.ms-works	Works Text Document
*.xhtml	application/xhtml+xml	Extensible HyperText Markup Language
*.xlc	application/vnd.ms-excel	MS Excel Chart
*.xlm	application/vnd.ms-excel	MS Excel Macro
*.xls	application/vnd.ms-excel	MS Excel Spreadsheet
*.xlt	application/vnd.ms-excel	MS Excel Template
*.xlw	application/vnd.ms-excel	MS Excel Workspace
*.xml	text/xml, application/xml	Extensible Markup Language
*.zip	application/zip	Compressed Archive