var deferred = new Deferred();
	var index = 0;
        results.forEach(function( item ){ //results是数组
        	index ++;
        	if( index === results.length - 1 ){
        		deferred.resolve(index);
        	}
			
	});
        
        deferred.then(function(last){
			
			if( last ){
				button.hidden = false;
			}else{
				button.hidden = true;
			}
		});