Considerations for total use of settimeout in JS

The use of setTimeout in JS is very high, the most common is the timer.

SetTimeout is very simple to use var r = SetTimeout (func, 1000);

First it is a return value, which can be used to clear settimeout,cleartimeout (R)

How SetTimeout is called

SetTimeout (func, 1000);

SetTimeout ("func ()", 1000);

SetTimeout (function () {func ()}, 1000);

The first way to pay particular attention to this is the point of this problem.

var A = function ()

{

This.key = 1;

This.valuesss = 1;

This.func = function ()

{

alert (THIS.VALUESSS);

}

}

var a = new A ();

SetTimeout (a.func,1000);

This time will definitely prompt to find valuesss, the reason is that this point to the window

Window.settimeout = function (Func,timer) {}

Considerations for total use of settimeout in JS