nodejs基于回调方式操作mysql的疑问？

你需要做的是流程控制，用promise吧

var getMenus = function() {
      return new Promise(function(resolve,reject){
            //getMenus
      }):
}
var getCarousel = function() {
      return new Promise(function(resolve,reject){
            //getCarousel 
      }):
}
var getRecommends = function() {
      return new Promise(function(resolve,reject){
            //getRecommends 
      }):
}
Promise.all([getMenus,getCarousel ,getRecommends ])
    .then(function(menus,carousel,recommends){
         res.render('index,{xxx})
    })