创建一个接受参数的 expressjs 中间件 [英] Creating a expressjs middleware that accepts parameters

问题描述

我正在尝试创建一个可以接受参数的中间件.这怎么办?

I am trying to create a middleware that can accept parameters. How can this be done?

示例

app.get('/hasToBeAdmin', HasRole('Admin'), function(req,res){

})

HasRole = function(role, req, res, next){
   if(role != user.role){
      res.redirect('/NotInRole);
   }

   next();
}

推荐答案

function HasRole(role) {
  return function(req, res, next) {
    if (role !== req.user.role) res.redirect(...);
    else next();
  }
}

我还想确保我不会制作同一个函数的多个副本:

I also want to make sure that I don't make multiple copies of the same function:

function HasRole(role) {
  return HasRole[role] || (HasRole[role] = function(req, res, next) {
    if (role !== req.user.role) res.redirect(...);
    else next();
  })
}

这篇关于创建一个接受参数的 expressjs 中间件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！