检查字符串是否为纯数字
function checkNumber(checkStr:String):Boolean; //检查字符串是否为纯数字
var
strLength:Integer;
iCircle:Integer;
strNumber: set of char;
begin
Result:=True;
strNumber:=[''0'',''1'',''2'',''3'',''4'',''5'',''6'',''7'',''8'',''9''];
strLength:=length(checkStr);
for iCircle:=1 to strLength do
begin
if not (checkStr[iCircle] in strNumber) then
begin
Result:=False;
break;
end;
end;
end;