JavaScript verifies that the type limit of the uploaded file must be _javascript for some formatting techniques

Copy Code code as follows:

Verifying the format of a file
function Validatefile () {
var fileobject=$ ("#filename");
var errorobject=$ ("#error");
var filepath=fileobject.val ();
var filearr=filepath.split ("//");
var filetarr=filearr[filearr.length-1].tolowercase (). Split (".");
var filetype=filetarr[filetarr.length-1];
if (filetype!= "xls" &&filetype!= "xlsx" &&filetype!= "Doc" &&filetype!= "docx"
&&filetype!= "JPEG" &&filetype!= "jpg" &&filetype!= "ppt" &&filetype!= "pptx"
&&filetype!= "TXT" &&filetype!= "BMP" &&filetype!= "PNG" &&filetype!= "gif") {
Fileobject.focus ();
errorobject.html ("Upload file must be a picture, doc, ppt, xls, TXT file!") ");
}else{
Errorobject.remove ();
}
}