JavaScript creates objects

JavaScript provides some commonly used built -in objects (introduced later), but in some cases we need to customize the objects to achieve special and rich functions.

For example, we create a "Student" object and specify several attributes and methods for them:

student = new Object();  // 创建对象“student”
student.name = "Tom";   // 对象属性 名字
student.age  = "19";    // 对象属性 年龄
student.study =function() {   // 对象方法 学习
    alert("studying");
};
student.eat =function() {     // 对象方法 吃
    alert("eating");
};

In addition, you can also create this object:

var student = {};
student.name = "Tom";
……

or this way :

var student = {
    name:"Tom";
     age:"19";
    ……
}

However, the above method will generate a lot of repeated code when creating multiple objects, so we can also use functions to create new objects:

function student(name,age) {
    this.name = name;
    this.age = age;
    this.study = function() {
        alert("studying");
    };
    this.eat = function() {
        alert("eating");
    }
}

Then create an instance of the student object through new :

var student1 = new student('Tom','19');
var student2 = new student('Jack','20');