input file类型，文件类型的限制
何问起 hovertree.com
直接限制input type='file'的文件类型限制，通过accept属性进行设定,多个类型用逗号分隔开,因为accept是html5的新特性，所以IE的支持就显得单薄了
效果展示：http://hovertree.com/texiao/html5/41/
如:
<!DOCTYPE html>
<html>
<head><meta name="viewport" content="width=device-width, initial-scale=1" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>input type=file 文件上传时后缀限定示例_何问起</title><base target="_blank" />
<meta charset="utf-8" />
<style>a{color:blue}</style>
</head>
<body>
<div style="max-width:600px;margin:0px auto;">
<h2>input type=file 文件上传时后缀限定示例</h2>
<form>
限定为图片：<input type=file accept="image/*" id="hovertree" />
<hr />
限定为png或者jpg图片：<input type="file" accept="image/png,image/jpeg" id="keleyi" />
<hr />
使用js限定文件格式为gif：<input type="file" id="hovertreescj" />
</form>
<br />
<a href="http://hovertree.com">首页</a> <a href="http://hovertree.com/h/bjaf/h1fenrfm.htm">代码说明</a> <a href="http://hovertree.com/texiao/">更多特效</a>
</div>
<script>
document.getElementById("hovertreescj").accept = "image/gif";
document.write(document.getElementById("hovertreescj").accept);
</script>
</body>
</html>
accept可以指定如下信息：
| *.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 |
| 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 | aplication/zip | Compressed Archive |
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