javasrcipt中的对象 Object


javascript中{}可以代表对象


1 javascript已经存在的类型的对象 

var v = new Date();
 var obj1 = new Object(), obj2 = {};//Object 对象
 var arr1 = new Array(), arr2 = [];//Array 对象
 var boo1 = new Boolean(true), boo2 = true;//Boolean 对象
 var num1 = new Number(123), num2 = 123.45;//Number 对象
 var str1 = new String("abc"), str2 = 'abc';//String 对象

2 自定义的对象1:

JSON
 var person={firstname:"John", lastname:"Doe", id:5566};
 alert(person.firstname);
 alert(person.lastname);
 alert(person.id);

3 自定义的对象2:

var p = 
 {       
    grade:1,
    name : "tom",
    age:27,
    sex:"男",
   
    speak:function(words)
    {
   alert(this.name+"说："+words+"!");
    }

 }
 p.speak("hello");

4 自定义的对象3: 

function Person(name){
 this.name = name;
 this.age = 20;

 this.say=say;
 
 }

 function say(){
 document.write(this.name+":大家好,我今年"+this.age+"岁了");
 }
 
 var p = new Person("张三");
 p.say();

 -----------------------------
 function Person(name){
 this.id = 1;
 this.name = name;
 this.age = 20;

 this.say=function(msg){
 document.write(this.name+" 说:"+msg);
 };
 }
 var p = new Person("张三");
 p.say();