Javascript - 如何定义构造函数 [英] Javascript - How to define a Constructor

问题描述

我有一个这样的对象：

Object1.prototype = {
    isInit: false,
    Get : function (){}
} 

现在我想添加一个带有一个参数的构造函数。我该怎么办？

Now I'd like to add a constructor which takes one parameter. How can I do it?

推荐答案

班级声明

var User = function(name, age) { // constructor
}

User.prototype = {}

实例变量（成员）

var User = function(name, age) {
    this.name = name;
    this.age = age;
}

User.prototype = {}

静态变量

var User = function(name, age) {
    this.name = name;
    this.age = age;
}

User.prototype = {
    staticVar: 15,
    anotherStaticVar: 'text'
}

这里我定义了两个静态变量。每个用户实例都可以访问这两个变量。请注意，我们可以使用值初始化它;

Here I defined two static variables. Each User instance has access to these two variables. Note, that we can initialize it with value;

实例函数（方法）

var User = function(name, age) {
    this.name = name;
    this.age = age;
}

User.prototype = {
    getName: function() {
        return this.name;
    },

    setName: function(name) {
        this.name = name;
    }
}

用法示例：

var user = new User('Mike', 29);
user.setName('John');
alert(user.getName()); //should be 'John'

静态函数

var User = function(name, age) {
    this.name = name;
    this.age = age;
}

User.create = function(name, age) {
    return new User(name, age);
}

User.prototype = {}

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