无法访问javascript变量中的对象属性

Question

我已经挣扎了一段时间寻求帮助。这真的很奇怪。我想访问一个对象属性，但这总是引发错误：

类型错误：无法读取未定义的属性模板

但我的应用程序运行正常。如果无法访问未定义的模板，则只有通知输出

//this is my object variabel 

var login = {};

login.data = {

    checkInput : formValidation,

    userSchema : User,

    template   : 'pages/users/login',

}

// so I add new method which I call in different files 

login.header = async(req, res, next) => { 

  /// in this section function I want to read property of template but it always return undefined 

  

  try {

    //  I have some code with read databases here 

    //some data i want to render 

    var data = {};

    res.render(this.data.template,data);

    

    // I've been also trying another way.

    var template = login.data.template !== undefined ?  'page/users/login' : login.data.template;

    

    res.render(login.data.template, data);

    

    // both of above always return output, but can't read template of undefined

    

  } catch(e) {

  

    throw new Error(e);

  }

}

Answer 1

我一直在尝试使用没有数组函数的属性访问var login = {}login.data = {  template : 'admin/pages/'  body : {}};login.getViews = function(req, res, next) {  // it'l throw an error   res.render(this.data.template, this.data.body);     // than i try with another way, it works     res.render(login.data.template, login.data.body);     }