number-cell 没有 top 和 left 的值
function updateBoardView(){
$(".number-cell").remove();
for( var i = 0 ; i < 4 ; i ++ )
for( var j = 0 ; j < 4 ; j ++ ){
$("#grid-container").append( '<div class="number-cell" id="number-cell-'+i+'-'+j+'"></div>' );
var theNumberCell = $('#number-cell-'+i+'-'+j);
if( board[i][j] == 0 ){
theNumberCell.css('width','0px');
theNumberCell.css('height','0px');
theNumberCell.css('top',getPosTop(i,j) + 50 );
theNumberCell.css('left',getPosLeft(i,j) + 50 );
}
else{
theNumberCell.css('width','100px');
theNumberCell.css('height','100px');
theNumberCell.css('top',getPosTop(i,j));
theNumberCell.css('left',getPosLeft(i,j));
theNumberCell.css('background-color',getNumberBackgroundColor( board[i][j] ) );
theNumberCell.css('color',getNumberColor( board[i][j] ) );
theNumberCell.text( board[i][j] );
}
}
}