JavaScript对象(Object)

osc_vsn7cspo 2020-11-11 11:46:26
javascript prototype


对象(Object)

对象由花括号分隔,在括号内部,对象的属性以名称和值对的形式 (name : value) 来定义,也叫json。
属性由逗号分隔,空格和折行无关紧要。声明可横跨多行。

定义一个对象, 姓名:Keafmd, 年龄:18 ,地址:北京,isEdu:false

样例代码:

var Ke = {
'name': 'Keafmd',
'age': 18,
address: '北京',
isEdu:false
}
console.log(Ke)

完整代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script>
var Ke = {

'name': 'Keafmd',
'age': 18,
address: '北京',
isEdu:false
}
console.log(Ke)
</script>
</head>
<body>
</body>
</html>

效果截图:
在这里插入图片描述

对象的创建

使用{}创建

var person = {
name : 'Keafmd',
sayHi:function(){
console.log('hi, my name is :'+this.name)
}
};

样例代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
var person = {

name : 'Keafmd',
sayHi:function(){

console.log('hi, my name is :'+this.name)
}
};
console.log(person)
person.sayHi()
</script>
<title></title>
</head>
<body>
</body>
</html>

效果截图:
在这里插入图片描述

使用Object创建

var p = new Object();
p.name = 'Keafmd';
p.age = 18;
console.log(p);

样例代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
var p = new Object();
p.name = 'Keafmd';
p.age = 18;
console.log(p);
</script>
<title></title>
</head>
<body>
</body>
</html>

效果截图:
在这里插入图片描述

使用Function创建

function Student(){
this.name = '';
this.age = 0;
}
var stu1 = new Student();
stu1.name = "Keafmd";
stu1.age = 18;
stu1.address = '哈尔滨';
console.log(stu1);
var stu2 = new Student();
console.log(stu2);

样例代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
function Student(){

this.name = '';
this.age = 0;
}
var stu1 = new Student();
stu1.name = "Keafmd";
stu1.age = 18;
stu1.address = '哈尔滨';
console.log(stu1);
var stu2 = new Student();
console.log(stu2);
</script>
<title></title>
</head>
<body>
</body>
</html>

效果截图:

在这里插入图片描述

使用class关键字

class Human{
constructor(name) {
this.name = name;
}
sayHi(){
console.log('我是: '+this.name);
}
}
var h1 = new Human('Keafmd');
h1.sayHi()

样例代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script>
class Human{

constructor(name) {

this.name = name;
}
sayHi(){

console.log('我是: '+this.name);
}
}
var h1 = new Human('Keafmd');
h1.sayHi()
</script>
<title></title>
</head>
<body>
</body>
</html>

效果截图:
在这里插入图片描述

对象的原型模型

通过对象可以给对象扩展字段(属性、方法)
如果想同一个类型,都添加属性,则需要用到原型 prototype

样例代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
<script>
function Student(){

this.name = '';
this.age = 0;
}
var s1 = new Student();
//给对象扩展方法
// s1.sayHi =function(){

// console.log('打招呼')
// }
//给原型扩展
Student.prototype.sayHi = function(){

console.log('打招呼')
}
s1.sayHi();
var s2 = new Student();
s2.sayHi();
</script>
</head>
<body>
</body>
</html>

效果截图:
在这里插入图片描述
写作不易,读完如果对你有帮助,感谢点赞支持!
如果你是电脑端,看见右下角的“一键三连”了吗,没错点它[哈哈]

在这里插入图片描述


加油!

共同努力!

Keafmd

版权声明
本文为[osc_vsn7cspo]所创,转载请带上原文链接,感谢
https://my.oschina.net/u/4304158/blog/4712396

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