小编sha*_*e01的帖子

当我在命令行中运行节点时，server.js出现以下错误：

C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms>node server.js
C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms\node_modules\express\lib\router\index.js:458
      throw new TypeError('Router.use() requires a middleware function but got a ' + gettype(fn))
      ^

TypeError: Router.use() requires a middleware function but got a Object
    at Function.use (C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms\node_modules\express\lib\router\index.js:458:13)
    at Function.<anonymous> (C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms\node_modules\express\lib\application.js:220:21)
    at Array.forEach (<anonymous>)
    at Function.use (C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms\node_modules\express\lib\application.js:217:7)
    at Object.<anonymous> (C:\Users\Shaelyn\WebstormProjects\CIT366Projects\cms\server.js:34:5)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Function.Module.runMain (module.js:684:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3

我认为部分原因可能是它mongoose.connect是一个未解决的函数。有谁知道如何修复这个错误？这是我的代码：

   // Get dependencies
    var express = require('express');
    var path …

我试图克隆我的数组,然后使用slice()函数从中删除一个元素.但是,每当我单击要删除的元素时,它会删除数组中除了单击之外的所有内容.

这是我目前的代码:

deleteContact(contacts: Contacts){
if (contacts === null || contacts === undefined) {
  return;
}

const pos = this.contacts.indexOf(contacts);
if (pos < 0) {
  return;
}

this.contacts = this.contacts.splice(pos, 1);
this.contactsListClone = this.contacts.slice();
this.contactListChangedEvent.next(this.contactsListClone);
}