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);

 

    

}