小编kyd*_*oco的帖子

我正在摆弄 Express JS，并且正在使用express-session。app.use(session())如果我不把中间件放在第一位的话是行不通的

app.use(session({
     name: 'server-session-cookie-id',
     secret: 'my express secret',
     saveUninitialized: true,
     resave: true
}));
app.use('/', routes);
app.set("view engine", "pug");
app.set("views", path.join(__dirname + "/views"));
app.use(flash());

如果app.use(session())先写它会说 thereq.session.someVariable未定义。

有人能解释一下 Express 如何调用 app.use 中间件吗？

我想知道如何在两个布尔变量之间切换.这在第一次运行代码时正常工作,但在第二次运行后输出不正确.

输出第一次运行switchPlayer():

player1.isActive = false,
player2.isActive = true

输出第二次运行switchPlayer():

player1.isActive = true,
player2.isActive = true

以下是我写的代码:

var Player = function(score, isActive){
  this.score = score;
  this.isActive = isActive;
}

Player.prototype.toggleIsActive = function(){
      if(this.isActive === false){
        this.isActive = true;
      } else{
        this.isActive = false;
      }
    }

function switchPlayer(){
  if(player1.isActive === true){
    player1.toggleIsActive();
    player2.toggleIsActive();
  } else{
    player1.isActive = true;
  }
}
var player1 = new Player("0", true);
var player2 = new Player("0", false);

switchPlayer();
switchPlayer();