how to implement back and forward functionality like browser

I want to implement functionality like back and forward in my project same as browser , like web page we have the screen. what i tried is intially m setting the currentscreenindex=-1

and when data of first screen comes execute this function

In screen data arrive function (){
   this.currentscreenindex++; 
   this.screenvisited[this.currentscreenindex]=data;

}

Here is my back function what i tried :

back(){
    currentscreenindex--;
    var screen=screenvisited[currentscreenindex];
    // will go to this screen
}

but what my problem is in these is :

                    currentscreenindex  screen data in screenvisted array
When 1st screen arrived     0     Data of 1st screen 
When 2st screen arrived     1     Data of 2st screen 
When 3st screen arrived     2     Data of 3st screen 
When 4st screen arrived     3     Data of 4st screen 
When 5st screen arrived     4     Data of 5st screen 
when user click back button 3     call the screen is set to 4th gib, 

so when data of 4th screen arrive , the current index will get incremented so currentindex=4 and data at current index 4 will be of 4th screen , i think it is not correct , because if data at currentindex=4 will get changed then i can't do forward , if yes pls tell how can i correct it ?

please suggest how can i write the proper back and forward function to do same functionality as browser .