res.redirect未定义

Question

我有以下函数写在server.js我一直得到 error: uncaughtException: Cannot call method 'redirect' of undefined

function(req, res) {
  async.waterfall([
    function(next){
      next(null, res);
    },

    function(next){
      next(null, res);
    },
    function(next, res){
      res.redirect('www.google.com')
    }
  ]);
}

从以下答案进行上述更改后我得到了,错误如下:

2014-09-04T13:56:08.678Z - error: uncaughtException: Object function (err) {
                if (err) {
                    callback.apply(null, arguments);
                    callback = function () {};
                }
                else {
                    var args = Array.prototype.slice.call(arguments, 1);
                    var next = iterator.next();
                    if (next) {
                        args.push(wrapIterator(next));
                    }
                    else {
                        args.push(callback);
                    }
                    async.nextTick(function () {
                        iterator.apply(null, args);
                    });
                }
            } has no method 'send' 

Answer 1

为什么需要将res作为瀑布参数传递？您可以在全局功能范围内使用它,就像这样

function(req, res) {
  async.waterfall([
    function(next){
      next();
    },

    function(next){
      next();
    },
    function(){
      res.redirect('www.google.com')
    }
  ]);
}