需求
上传视频文件：
1、支持点击上传与拖拽上传；
2、只支持固定格式（eg:mp4,avi,mkv等等）的文件上传，最多不超过3G，否则给出提示。
思路
1、input:file 的accept属性
点击上传可以用input:file 的accept属性，限制可以选择的文件MIME类型(常用的MIME类型见下表)。
2、js控制
但是拖拽的时候就没办法满足需求，所以同时使用js控制 —— 在change事件中做限制。
获取到文件信息后判断是否符合要求，不符合则return 中止上传。
代码
html代码
<input
type="file"
accept="video/wmv, video/avi, video/mp4, video/flv, video/3gp, video/mov, video/mkv, video/vob"
@change="fileChange"
/>
js代码：
fileChange(e) {
let file = e.target.files[0]
if (file) {
const fileSize = file.size
const isLt3G = fileSize / 1024 / 1024 / 1024 < 3
if (!isLt3G) {
this.$message({
message: '上传文件大小不超过3G',
type: 'error'
})
file = ''
return
}
const name = file.name
const fileName = name.substring(name.lastIndexOf('.') + 1).toLowerCase()
if (
fileName !== 'wmv' &&
fileName !== 'avi' &&
fileName !== 'mp4' &&
fileName !== 'flv' &&
fileName !== '3gp' &&
fileName !== 'mov' &&
fileName !== 'mkv' &&
fileName !== 'vob'
) {
this.$message({
message:
'请选择格式文件(wmv、avi、mp4、flv、3gp、mov、mkv、vob)上传！',
type: 'error'
})
file = ''
return
}
}
},
常用MIME类型
后缀名 MIME名称
*.3gpp audio/3gpp, video/3gpp
*.ac3 audio/ac3
*.asf allpication/vnd.ms-asf
*.au audio/basic
*.css text/css
*.csv text/csv
*.doc application/msword
*.dot application/msword
*.dtd application/xml-dtd
*.dwg image/vnd.dwg
*.dxf image/vnd.dxf
*.gif image/gif
*.htm text/html
*.html text/html
*.jp2 image/jp2
*.jpe image/jpeg
*.jpeg image/jpeg
*.jpg image/jpeg
*.js text/javascript, application/javascript
*.json application/json
*.mp2 audio/mpeg, video/mpeg
*.mp3 audio/mpeg
*.mp4 audio/mp4, video/mp4
*.mpeg video/mpeg
*.mpg video/mpeg
*.mpp application/vnd.ms-project
*.ogg application/ogg, audio/ogg
*.pdf application/pdf
*.png image/png
*.pot application/vnd.ms-powerpoint
*.pps application/vnd.ms-powerpoint
*.ppt application/vnd.ms-powerpoint
*.rtf application/rtf, text/rtf
*.svf image/vnd.svf
*.tif image/tiff
*.tiff image/tiff
*.txt text/plain
*.wdb application/vnd.ms-works
*.wps application/vnd.ms-works
*.xhtml application/xhtml+xml
*.xlc application/vnd.ms-excel
*.xlm application/vnd.ms-excel
*.xls application/vnd.ms-excel
*.xlt application/vnd.ms-excel
*.xlw application/vnd.ms-excel
*.xml text/xml, application/xml
*.zip aplication/zip
*.xlsx application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
input file 文件上传,js控制上传文件的大小和格式
