javascript实现2048游戏示例(2)

window.onload = function(){
 var container = document.getElementById('div2048');
 startBtn = document.getElementById('start');
 startBtn.onclick = function(){
  this.style.display = 'none';
  game = game || new game2048(container);
  game.init();
 }
}

window.onkeydown = function(e){
 var keynum, keychar;
 if(window.event){  // IE
  keynum = e.keyCode;
 }
 else if(e.which){  // Netscape/Firefox/Opera
  keynum = e.which;
 }
 keychar = String.fromCharCode(keynum);
 if(['W', 'S', 'A', 'D'].indexOf(keychar) > -1){
  if(game.over()){
   game.clean();
   startBtn.style.display = 'block';
   startBtn.innerHTML = 'game over, replay?';
   return;
  }
  game.move(keychar);
 }
}

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