JavaScript面向对象基础

一, 对象的基本操作

1. 创建对象

// 创建空白对象

var obj1 = {};

var obj2 = new Object();



// 创建包含初始值的对象

var person = {

    "Name": "Terry",

    "age": 27,

    "sex:": "male"

};



alert(person.Name); // Terry

alert(person.sex); // male

 

2. 对象访问

下面代码显示访问对象属性的两种方法

var person = {};

person.name = "Terry";

person["age"] = 27;

alert(person.name + " " + person.age);



var nameList = {

    name1: "n1",

    "name2": "n2",

    name3: "n3"

};



var strName;



// 访问nameList中的值-1

for (var name in nameList) {

    strName += nameList[name] + " ";

}

alert(strName);

strName = "";



// 访问nameList中的值-2

for (var i = 0; i < 3; i++) {

    strName += nameList["name" + (i + 1)];

}

3. delete可以删除某对象中的属性；判断某属性是否存在在一个对象可以用in操作符

var nameList = {

    name1: "n1",

    "name2": "n2",

    name3: "n3"

};



alert(nameList.name1); // n1

delete nameList.name1;



alert("name1" in nameList); // false

3. constructor属性-对应对象初始化时的构造函数

var date = new Date();

alert(date.constructor); // Date

alert(date.constructor == Date);// true