一段控制進度條的定時裝置
var Runner = function(){
    var f = function(v, pbar, btn, count, cb){
        return function(){
            if(v > count){
                btn.dom.disabled = false;
                cb();
            }else{
                if(pbar.id=='pbar4'){
                    //give this one a different count style for fun
                    var i = v/count;
                    pbar.updateProgress(i, Math.round(100*i)+'% completed...');
                }else{
                    pbar.updateProgress(v/count, 'Loading item ' + v + ' of '+count+'...');
                }
            }
       };
    };
    return {
        run : function(pbar, btn, count, cb){
            btn.dom.disabled = true;
            var ms = 5000/count;
            for(var i = 1; i < (count+2); i++){
               setTimeout(f(i, pbar, btn, count, cb), i*ms);
            }
        }
    }
}();