2048.js

function getGridString(grid){
    var a = "";
    for(var i=0; i<=3; i++){
        for(var j=0; j<=3; j++){
            if(grid[j][i]){
                a += grid[j][i].value.toString();
            } else {
                a += "0";
            }
        }
    }
    return a;
}

var grid = getGridString(gameManager.grid.cells);
var up=0, down=0, right=0;

for(var i=1;i<=300;i++){
    grid = getGridString(gameManager.grid.cells);
    gameManager.move(0);
    gameManager.move(3);
    up++;
    if(grid == getGridString(gameManager.grid.cells)){
        gameManager.move(2);
        down++;
        if(grid == getGridString(gameManager.grid.cells)){
            gameManager.move(1);
            right++;
        }
    }
    if(gameManager.over){
        break;
    }
}

var score = gameManager.score;
console.log("score:"+score);
console.log("up:"+up);
console.log("down:"+down);
console.log("right:"+right);