Question

我试图在构造函数中调用方法，是不可能还是我错过了什么？

function Rectangle(height, width) {
  this.height = height;
  this.width = width;
  this.calcArea = function() {
    console.log(this.height);
    return this.height * this.width;
  };
  this.calcArea(); // trying to do it here, its invoked but no result  
 }
var newone = new Rectangle(12,24);

Answer 1

您可以尝试这样的事情：

function Rectangle(height, width) {
  var self = this;
  self.height = height;
  self.width = width;
  self.calcArea = (function() {
    console.log(this.height);
    return self.height * self.width;
  })();
 }
var newone = new Rectangle(12,24)
console.log(newone.calcArea);

Answer 2

它工作得很好。您没有使用返回的值。

function Rectangle(height, width) {
  this.height = height;
  this.width = width;
  this.calcArea = function() {
    console.log(this.height);
    return this.height * this.width;
  };
  var area =this.calcArea(); // trying to do it here, its invoked but no result  
  console.log(area); //288
 }
var newone = new Rectangle(12,24);

我可以在构造函数中调用this.method

2 个答案: