javascript - 如何将匿名函数的返回值存储到 JavaScript 中的变量？

Question

我对 JavaScript 非常陌生，所以请多多包涵。这是我的代码片段:

function Course(title, instructor, views){

  this.title= title;
  this.instructor = instructor;
  this.views = views;
  this.updateViews = function() {
    return ++this.views;
  };

}

var course1 =   new Course('JS', 'Sarun', 0);

console.log(course1.updateViews);

然而，在执行时，我预计 course1.updateViews 的值为 1。相反，我在控制台中显示了整个函数，如下所示:

ƒ () {
    return ++this.views;
  }

我确信这是初学者的错误。那么有人可以纠正我吗？

Answer 1

So can anyone please Correct me on this?

您需要使用()调用函数

console.log(course1.updateViews());

function Course(title, instructor, views){

  this.title= title;
  this.instructor = instructor;
  this.views = views;
  this.updateViews = function() {
    return ++this.views;
  };

}

var course1 =   new Course('JS', 'Sarun', 0);

console.log(course1.updateViews());