给个例子:
function callback()
{
alert("callback");
}
function callback2()
{
alert("callback2");
}
function chooseCallback(iChoice)
{
switch (iChoice)
{
case 0:
return callback;
case 1:
return callback2;
default:
return "";
}
}
// if i is 0, callback is invoked after 5 seconds
// if i is 1, callback2 is invoked
// otherwise, the timer is not set
window.setInterval(chooseCallback(i), 5000);