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<script type="text/javascript">
var obj = new Object();
//动态添加属性
obj.name="张三";
obj.age = 15 ;
obj["addr"]="铜锣湾";
obj.sayHello=function(){
console.log("姓名:"+this.name+",年龄"+this.age+",地址:"+this.addr);
}
obj.sayHello();
//动态删除属性
delete obj.addr;
obj.sayHello();
</script>
在js中,属性可以动态添加,也可以动态删除
json的格式的表现形式
表现形式1
<script type="text/javascript">
var obj={"name":"zhangsan","age":15,"addr":"南京"};
console.log(obj.name,obj.age,obj.addr);
console.log(typeof obj);
</script>
表现形式2
注意:value的取值可以是以下内容
对于以上的结构,那么json的变种就非常丰富
案例1:
var obj=["张三",15,true,
{
"fatherName":"张无忌",
"motherName":"无忌张",
children:["张飞","张亮","张靓颖"]
}
];
alert(typeof obj)
alert(obj[0]);
alert(obj[3]["children"])
案例2:
var obj3= {
"name":"zhangsan",
"age":15,
children:[
{
name:"张一",
age:1
},
{
name:"lisi",
age:10
},
{
name:"wangwu",
age:12
}
],
sayInfo:function(){
console.log(this.name,this.age);
}
};
obj3.sayInfo();
for(var i = 0 ;i<obj3.children.length;i++) {
console.log(obj3.children[i].name,obj3.children[i].age)
}
function createObject(name,age){
var obj = new Object();
obj.name = name ;
obj.age = age
obj.sayHello=sayHello;
return obj ;
}
var sayHello=function(){
console.log(this.name,this.age);
}
var obj1 = createObject("张三",12);
obj1.sayHello();
var obj2 = createObject("李四",20);
obj2.sayHello();
<script type="text/javascript">
function Person(name,age){
this.name = name ;
this.age =age ;
this.sayHello= sayHello;
}
function sayHello(){
console.log(this.name,this.age)
}
//隐藏了一个创建的对象的过程
var p1 =new Person("张三",12);
var p2 = new Person("李四",15);
p1.sayHello();
p2.sayHello();
</script>
<script type="text/javascript">
function Person(name,age){
this.name = name ;
this.age = age ;
}
Person.prototype.sayHello = function(){
console.log(this.name,this.age);
}
var p1 = new Person("张三",15);
var p2 = new Person("lisi",16);
p1.sayHello();
p2.sayHello();
</script>
使用原型+构造函数方式来定义对象,对象之间的属性互不干扰,各个对象间共享同一个方法
优化上面的案例
<script type="text/javascript">
function Person(name,age) {
this.name = name ;
this.age = age ;
//第一次创建对象的,通过参数给原型上增加一个共享的方法
if(typeof Person.prototype.flag==="undefined") {
alert("invoked...");
Person.prototype.sayInfo = function(){
console.log(this.name,this.age)
};
Person.prototype.flag = true ;
}
}
var p1 = new Person("zhangsan",12);
var p2 = new Person("lisi",15);
p1.sayInfo();
p2.sayInfo()
</script>
function Parent(name,age) {
this.name= name ;
this.age = age ;
this.sayInfo = function(){
console.log(this.name,this.age) ;
}
}
function Son(name,age,addr) {
this.method=Parent;
this.method(name,age);
this.addr = addr ;
//将自定义的method方法删除掉
delete this.method;
this.sayInfo=function(){
console.log(this.name,this.age,this.addr) ;
}
}
function Parent(name,age) {
this.name = name ;
this.age = age ;
this.sayInfo=function(){
console.log(this.name,this.age);
};
}
function Son(name,age,addr) {
//call接受的离散的值,apply的参数为数组
//Parent.call(this,name,age);
Parent.apply(this,new Array(name,age));
this.addr = addr ;
this.sayInfo=function(){
console.log(this.name,this.age,this.addr);
}
}
var s = new Son("张三",15,"北京");
console.log(s)
s.sayInfo();
<script type="text/javascript">
//apply|call+原型混合方式
function Parent(name,age) {
this.name = name ;
this.age = age ;
}
Parent.prototype.sayInfo=function(){
console.log(this.name,this.age);
}
function Son(name,age,addr) {
//只能做属性复制
Parent.apply(this,new Array(name,age));
this.addr = addr ;
}
//拿原型中方法
Son.prototype=new Parent();
var s = new Son("zhangsan",12);
console.log(s)
<script>
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