Special javascript usage

, Can be exchanged for example:
<Script type = "text/javascript">
/* Function update ()
{
Var name = dwr. util. getValue ("demoName ");
Demo. sayHello (name, function (data ){
Dwr. util. setValue ("demoReply", data );
Dwr. util. setValue ("demoReply2", data );
});
}*/
/*
Function setData (data)
{
Dwr. util. setValue ("demoReply", data );
Dwr. util. setValue ("demoReply2", data );
}
Function update ()
{
Var name = dwr. util. getValue ("demoName ");
Demo. sayHello (name, setData );
}
*/
Function update ()
{
Var name = dwr. util. getValue ("demoName ");
Var name2 = $ ("demoName"). value;
Var name3 = document. getElementById ("demoName"). value;
Alert (name2 + name3 + name );
Demo. sayHello (name ,{
Callback: function (data)
{
Dwr. util. setValue ("demoReply", data );
Dwr. util. setValue ("demoReply2", data );
}
});
}
Hot = function hot () {alert ("Sweat .");}
Cold = function cold () {alert ("Shiver .");}
Function swap ()
{
Temp = hot;
Hot = cold;
Cold = temp;
Alert ("Swap .");
}
</Script>

Two functions can be exchanged, just like normal variables.