把这三行代码贴到FF/Chrome浏览器的console里边就好了。有兴趣的同学可以让它变得强大一些。 total
=
25
;
myClock
=
setInterval
(
function
()
{
total
=
total
-
1
;
console
.
log
(
"Remaining "
+
total
+
" mins"
);
if
(
total
===
0
)
{
cancelClock
();
alert
(
"Done"
);
}},
1000
*
60
);
cancelClock
=
function
()
{
clearInterval
(
myClock
);
}
代码段同时也放在这里了： https://code.csdn.net/snippets/692668