JavaScript 基础篇之对象、数组使用介绍（三）

复制代码 代码如下:

var empty = {} //创建一个没有属性的对象。
var person = {name:"ben",age:22,sex:'男'}//使用直接量创建对象
var people = {{name:'Frank',age:21},{name:'Mary',age:21},sex:'MAN'}// 对象的元素可以是对象

复制代码 代码如下:

var person = {}; //创建一个对象
person.name = "Frank"; //添加属性
person.country = "china";
person.age = 22;
person.american = new Object(); //这个属性是个对象
person.american.name = "Lisa";
person.american.country = "American";
person.american.age = 20;
function displayperson(personmore) //打印上面的对象
{
for(var p in personmore) //枚举循环
{
if(typeof(personmore[p]) == "object")//判断类型
{
for(var o in personmore[p])
{
document.write("American people :" +o+"\t" +personmore[p][o]+"<br />");
}
document.write("<br />");
continue;//结束本次循环，进行下一次循环.
document.write("china people :"+ p+"\t" + personmore[p] +"<br />");
}
}
displayperson(person);//调用函数
//输出china people :name Frank
//china people :country china
//china people :age 22
//American people :name Lisa
//American people :country American
//American people :age 20

复制代码 代码如下:

delete person.american;//就可以自己删除对象的属性
delete 是不能删除对象的。

复制代码 代码如下:

function House(price,area,developers)
{
this.price = price;
this.area = area;
this.developers = developers;
}
House.prototype.housevalue = function(){return this.price*this.area;}
function HouseSon(price,area,developers,city)
{
House.call(this,price,area,developers);
this.city = city;
}
HouseSon.prototype = new House(10000,80,"vanke");//获取House的属性
delete HouseSon.prototype.price;//删除
delete HouseSon.prototype.area;
delete HouseSon.prototype.developers;
HouseSon.prototype.container = function(){return "container" + this.price * this.area;}
for(var i in HouseSon.prototype)
{
document.write(i+"<br />");
}
var house = new HouseSon(20000,180,"vanke","shenzhen");
document.write(house.container()+"<br />");
document.write(house.housevalue()+"<br />");
document.write(house.hasOwnProperty("housevalue")+"<br />");//这是原型
document.write(house.hasOwnProperty("price")+"<br />");//本地

复制代码 代码如下:

var array = [] //不包涵任何元素的数组
var person = ["Frank",22,'男 '];//带不同元素的数组
var value = 100;
var num = [value+12,value-23,value*2];//支持表达式
//当然还有使用Array来创建，可以有不同类型的参数，可以是对象，数组等。

复制代码 代码如下:

function diaplayarray(arr) //执行打印任务的函数
{
if(!arr)return;
for(var num =0;num<arr.length;num++)
{
document.write("Num is "+ arr[num]+ "\t");
}
document.write(" "+"<br />");
}
var array = [2,32,14,57,6];
document.write(array.shift()+"<br />"); //删除数组中的第一个，返回删除的值2
document.write(array.pop()+"<br />"); //删除数组中的最后一个，返回删除的值6
document.write(array.join("*")+"<br />");//将数组元素用*连接返回一个字符串32*14*57
document.write(array.push(100) +"<br />");//添加数组元素
array.reverse();//颠倒数组元素顺序
diaplayarray(array);//输出Num is 100 Num is 5 Num is 4 Num is 3
array.splice(1,2,300,600);//从数组第二个开始删除（含第二个），到第三个,后面300，600是新插入的值
diaplayarray(array);//输出Num is 100 Num is 300 Num is 600 Num is 32