$(
function () {
var
Sys = {};
var
ua =
navigator.
userAgent.
toLowerCase();
var
s;
(
s =
ua.
match(
/rv:
([
\d.
]
+
)
\)
like gecko/)) ?
Sys.
ie =
s[
1] :
(
s =
ua.
match(
/msie
([
\d.
]
+
)
/)) ?
Sys.
ie =
s[
1] :
(
s =
ua.
match(
/firefox
\/
([
\d.
]
+
)
/)) ?
Sys.
firefox =
s[
1] :
(
s =
ua.
match(
/chrome
\/
([
\d.
]
+
)
/)) ?
Sys.
chrome =
s[
1] :
(
s =
ua.
match(
/opera.
([
\d.
]
+
)
/)) ?
Sys.
opera =
s[
1] :
(
s =
ua.
match(
/version
\/
([
\d.
]
+
)
.
*
safari/)) ?
Sys.
safari =
s[
1] :
0;
if (
Sys.
ie)
document.
write(
'IE: ' +
Sys.
ie);
if (
Sys.
firefox)
document.
write(
'Firefox: ' +
Sys.
firefox);
if (
Sys.
chrome)
document.
write(
'Chrome: ' +
Sys.
chrome);
if (
Sys.
opera)
document.
write(
'Opera: ' +
Sys.
opera);
if (
Sys.
safari)
document.
write(
'Safari: ' +
Sys.
safari);
});
最终结果呈现形式：Chrome: 67.0.3396.99；
ua的结果呈现形式是：mozilla/5.0 (linux; android 6.0; nexus 5 build/mra58n) applewebkit/537.36 (khtml, like gecko) chrome/67.0.3396.99 mobile safari/537.36
