javascript关闭错误时间“存储”值

这是一个已知问题。但您可以轻松地在每个循环迭代中创建一个闭包:

(function(current_diff) {
    setTimeout(function() {_change_score_by(current_diff);},
               step * 25);
})(diff);

用ECMAScript第五版的解决闭包循环问题变得不那么麻烦 Function#bind 方法:

setTimeout(_change_score_by.bind(window, diff), step*25);

你可以 hack this feature 到目前还不支持它的浏览器中获取好处。

Nikita's approach 作品(谢谢!)但就我个人而言,我更喜欢把它改成更明确的方式:

function _schedule_score_change(diff, step){
  setTimeout( function(){ _change_score_by(diff) },
              step*25 );
}

function _award(points){    
  var step = 1;
  while(points){
    var diff = Math.ceil(points / 10);
    _schedule_score_change(diff, step);
    points -= diff;
    step++;
  }
}