type=file上传文件时accept限制文件类型

accept限制上传文件类型 < input type=“file” accept="" /> accept的值为：javascript 格式 accept类型 *.3gpp audio/3gpp, video/3gpp *.ac3 audio/ac3 *.asf allpication/vnd.ms-asf *.au audio/basic *.css text/css *.csv text/c

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