Tips for using timer example _ JavaScript in javascript

This article mainly introduces how to use timer in JavaScript and provides examples of various test cases. For more information, see The Code is as follows:

Function foo ()
{
}
SetInterval ("foo ()", 1000 );

If OO technology is used,

The Code is as follows:

// Constructor
Function MyObj
{
Function foo ()
{
Alert (this. data );
}

This. timer = foo;
This. data = "Hello ";

SetInterval ("this. timer ()", 1000 );
}

Function Another ()
{
// Create timer when create object
Var obj = new MyObj ();

}

However, it cannot work as you think. The reason is that the setInterval () function does not recognize this variable. A workaround method can be as follows.

The Code is as follows:

Function Another ()
{
Var obj = nw MyObj ();
SetInterval ("obj. timer ()", 1000 );
}

Obviously, it works right, but if you are a perfectionist, you will not be satisfied with it. Fortunately, this action can be put into the constructor, and the form changes a bit.

The Code is as follows:

// Constructor
Function MyObj
{
Function foo ()
{
Alert (this. data );
}

This. timer = foo;
This. data = "Hello ";

Var self = this;
SetInterval (function () {self. timer () ;}, 1000 );
}

Function Another ()
{
Var obj = new MyObj ();

}

OK. You can use a closure. As for the reason, I want to give it to readers.

Finally, let's give an example of various test cases.

The Code is as follows:

<BR> Hello Timer <BR>