el-uplload 文件类型

file.type == "image/gif" ||
file.type == "image/jpg" ||
file.type == "image/jpeg" ||
file.type == "image/png"||
file.type"text/plain"||//text
file.type"application/pdf"||//pdf
file.type"application/x-zip-compressed"||//zip
file.type"application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"||//xlsx
file.type"application/vnd.ms-excel"||//xlx
file.type"application/msword"//doc