How to close a document if I press Esc key while running a script. Please help me

You should be able to catch the user cancel. This is how Image Processor.jsx does it:

Depending on your operation it is difficult to capture the ESC key however. Your mileage may vary.

// Lot's of things can go wrong

// Give a generic alert and see if they want the details

catch( e ) {

  if ( e.number != 8007 ) { // don't report error on user cancel

  if ( confirm( strSorry ) ) {

  alert( e + " : " + e.line );

  }

  }

    gScriptResult = 'cancel'; // quit, returning 'cancel' (dont localize) makes the actions palette not record our script

}

We have also added a progress bar via the application: Here is an example:

var d;

// doForcedProgress("Testing", "Testing()");

doProgress("Testing", "Testing()"); // this waits 3 or so seconds before showing

function Testing() {

    try {

        if (documents.length == 0)

            d = documents.add();

        else

            d = activeDocument;

        var keepGoing = true;

        for (var i = 0; i < 100 && keepGoing; i++) {

            keepGoing = doProgressSubTask(i, 100, "DoIt()");

        }

        if (!keepGoing)

            alert("User canceled");

    } catch(e) {

        alert("Testing: " + e);

    }

}

function DoIt() {

    try {

        d.artLayers.add();

    }

    catch(e) {

        alert("DoIt: " + e);

    }

}

how can i make function on Esc key to close current file..please write javascript

The other thing with the esc key is that it will terminate the script, but if Photoshop has not caught up with the script, it will seem like it keeps on running. This happens with you have a loop. The script will have run the loop, but it will take Photoshop a long time to catch.

As far as I know the ESC Key can be used to Break/stop a running scripts execution.  The script's execution will be terminated. Where in the script execution is it terminated  would be unknown and a script could  have opened many document or closed all open documents.   If you want to terminate a particular script and close a document it has been working on because you can see that processing has gone south.  I would thing you would need to program that capability into to the script.  You would have to set some way that you can signal the script to close the document and end execution.  I do not think you can do the using the ESC key. Except in ScriptUI but with ScriptUI it would be just as east to set up a stop button. ESC in ScriptUI is like a cancel event.