indexfilename=Request.ServerVariables("PATH_TRANSLATED")
把Request.ServerVariables("PATH_TRANSLATED")的值赋给indexfilename
indexfilename=right(indexfilename,(len(indexfilename)-instrRev(indexfilename,"\")))
把right(indexfilename,(len(indexfilename)-instrRev(indexfilename,"\")))的值赋给indexfilename
right(indexfilename,(len(indexfilename)-instrRev(indexfilename,"\"))) 里面的indexfilename是上一行的indexfilename
showfile=indexfilename
把indexfilename的值赋给showfile
这个indexfilename是上一行的indexfilename