javascript - JavaScript对象中的构造方法(Constructors in JavaScript objects)

Question

Can JavaScript classes/objects have constructors?(JavaScript类/对象可以具有构造函数吗？)

How are they created?(它们是如何创建的？)   ask by Click Upvote translate from so

Answer 1

Using prototypes:(使用原型：)

function Box(color) // Constructor { this.color = color; } Box.prototype.getColor = function() { return this.color; }; Hiding "color" (somewhat resembles a private member variable):(隐藏“颜色”（有点像私有成员变量）：) function Box(col) { var color = col; this.getColor = function() { return color; }; } Usage:(用法：) var blueBox = new Box("blue"); alert(blueBox.getColor()); // will alert blue var greenBox = new Box("green"); alert(greenBox.getColor()); // will alert green