js中数据类型，对象，构造函数详解-js教程-PHP中文网

首页

web前端

js教程

js中数据类型，对象，构造函数详解

零下一度

Jul 02, 2017 am 09:20 AM

javascript js

JavaScript数据类型，对象，构造函数，原型对象，初识原型链，对象继承

一.单词部分

①object父类②constructor构造函数③instance实例④call调用

⑤apply应用⑥combination组合⑦inheritance继承

二.预习部分

1.简述创建对象的两种方法，以及两者的区别

new 和字面量赋值

前者要用点.添加属性和方法

后者直接调用

2.简述使用构造函数创建实例的步骤

①创建一个新对象

②将构造函数的作用域赋值给新对象

③执行构造函数代码块

④返回新对象

3.简述原型链在继承中的作用

它是实现继承的主要方法

三.上机部分

1.创建person对象


	lang="en">

	charset="UTF-8">
	创建person对象<span class="html-tag">




	id="aa">
	<script> </span></td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var person=new Object();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.name="郎晓明";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.age="38";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.job="中国内地男演员、歌手";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.address="中国北京海淀区";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.info=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var strr="姓名："+this.name+"<br/>年龄："+this.age+"<br/>工作："+this.job+"<br/>住址："+this.address;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//document.write(strr);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">document.getElementById("aa").innerHTML=strr;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">person.info();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"><span class="html-tag"></script>

2.创建person构造函数


	lang="en">

	charset="UTF-8">
	上机练习二<span class="html-tag">


	id="aa">
	<script> </span></td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Person(name,age,job,address) {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.name=name;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.age=age;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.job=job;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.address=address;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.show=function() {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var strr="姓名："+this.name+"<br/>年龄："+this.age+"<br/>工作："+this.job+"<br/>住址："+this.address;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">document.getElementById("aa").innerHTML=strr;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Pers(){</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//var newper=new Person("郎晓明","38","中国内地男演员、歌手","中国北京海淀区");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Pers.prototype.name1="陈东";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Pers.prototype.age1="20";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Pers.prototype.job1="IT";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Pers.prototype.address1="河南省";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Pers.prototype.showinn=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var strrr="姓名："+this.name1+"<br/>年龄："+this.age1+"<br/>工作："+this.job1+"<br/>住址："+this.address1;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">document.getElementById("aa").innerHTML=strrr;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var one=new Pers();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">one.showinn();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//newper.show();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"><span class="html-tag"></script>

3.创建person对象原型链


	lang="en">

	charset="UTF-8">
	上机练习三<span class="html-tag">


	id="aa">
	<script> </span></td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Person(nation,skinColor) {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.nation=nation;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.skinColor=skinColor;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var aaa=document.getElementById("aa");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.shownation=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st="民族："+this.nation;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi.innerHTML=st;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">aaa.appendChild(createTi)</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.showskin=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi1=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st1="肤色："+this.skinColor;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi1.innerHTML=st1;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">aaa.appendChild(createTi1);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Woman() {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Person.call(this,"满族","黑色");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.sex="女";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var sexa=document.getElementById("aa");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//Woman.prototype=new Person("汉族","黄色");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Woman.prototype.showsex=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi3=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st3="性别："+this.sex;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi3.innerHTML=st3;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">sexa.appendChild(createTi3);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//var per1=new Person("汉族","黄色");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var wo=new Woman();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">wo.shownation();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">wo.showskin();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">wo.showsex();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"><span class="html-tag"></script>

4.创建继承person的student子类


	lang="en">

	charset="UTF-8">
	上机练习四<span class="html-tag">


	id="aa">
	<script> </span></td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Person(name,chinese,math) {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.name=name;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.chinese=chinese;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.math=math;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var aaa=document.getElementById("aa");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.showname=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st="姓名："+this.name;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi.innerHTML=st;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">aaa.appendChild(createTi)</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.showchinese=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi1=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st1="语文："+this.chinese;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi1.innerHTML=st1;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">aaa.appendChild(createTi1);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.showmath=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi2=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st2="数学："+this.math;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi2.innerHTML=st2;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">aaa.appendChild(createTi2);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">function Student() {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Person.call(this,"少君","56","96");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">this.age="19";</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var sexa=document.getElementById("aa");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//Student.prototype=new Person("陈东","88","99");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">Student.prototype.showage=function () {</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var createTi3=document.createElement("p");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var st3="年龄："+this.age;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">createTi3.innerHTML=st3;</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">sexa.appendChild(createTi3);</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">}</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"> </td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">//var per1=new Person("汉族","黄色");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">var stu=new Student();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">stu.showname();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">stu.showchinese();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">stu.showmath();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">stu.showage();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">/var ncm = new Person("陈东","88","99");</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">ncm.showname();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">ncm.showchinese();</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content">ncm.showmath();/</td> </tr> <tr> <td class="line-number"> </td> <td class="line-content"><span class="html-tag"></script>

四.总结

1.对象分为内置对象和自定义对象

2.原型链是实现继承的主要方法

3.组合继承的思路是使用原型链实现对原型属性和方法的继承

欢迎提问，欢迎指错，欢迎讨论学习信息有需要的私聊发布评论即可都能回复的

以上是js中数据类型，对象，构造函数详解的详细内容。更多信息请关注PHP中文网其他相关文章！

本站声明

本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn

热AI工具

热工具

热门话题

gmail邮箱登陆入口在哪里

7518

CakePHP 教程

1378

steam的账户名称是什么格式

win11激活密钥永久

NYT连接提示和答案

显示更多

Related knowledge

如何使用WebSocket和JavaScript实现在线语音识别系统 Dec 17, 2023 pm 02:54 PM

如何使用WebSocket和JavaScript实现在线语音识别系统引言：随着科技的不断发展，语音识别技术已经成为了人工智能领域的重要组成部分。而基于WebSocket和JavaScript实现的在线语音识别系统，具备了低延迟、实时性和跨平台的特点，成为了一种被广泛应用的解决方案。本文将介绍如何使用WebSocket和JavaScript来实现在线语音识别系

推荐：优秀JS开源人脸检测识别项目 Apr 03, 2024 am 11:55 AM

人脸检测识别技术已经是一个比较成熟且应用广泛的技术。而目前最为广泛的互联网应用语言非JS莫属，在Web前端实现人脸检测识别相比后端的人脸识别有优势也有弱势。优势包括减少网络交互、实时识别，大大缩短了用户等待时间，提高了用户体验；弱势是：受到模型大小限制，其中准确率也有限。如何在web端使用js实现人脸检测呢？为了实现Web端人脸识别，需要熟悉相关的编程语言和技术，如JavaScript、HTML、CSS、WebRTC等。同时还需要掌握相关的计算机视觉和人工智能技术。值得注意的是，由于Web端的计

股票分析必备工具：学习PHP和JS绘制蜡烛图的步骤 Dec 17, 2023 pm 06:55 PM

股票分析必备工具：学习PHP和JS绘制蜡烛图的步骤，需要具体代码示例随着互联网和科技的快速发展，股票交易已经成为许多投资者的重要途径之一。而股票分析是投资者决策的重要一环，其中蜡烛图被广泛应用于技术分析中。学习如何使用PHP和JS绘制蜡烛图将为投资者提供更多直观的信息，帮助他们更好地做出决策。蜡烛图是一种以蜡烛形状来展示股票价格的技术图表。它展示了股票价格的

WebSocket与JavaScript：实现实时监控系统的关键技术 Dec 17, 2023 pm 05:30 PM

WebSocket与JavaScript：实现实时监控系统的关键技术引言：随着互联网技术的快速发展，实时监控系统在各个领域中得到了广泛的应用。而实现实时监控的关键技术之一就是WebSocket与JavaScript的结合使用。本文将介绍WebSocket与JavaScript在实时监控系统中的应用，并给出代码示例，详细解释其实现原理。一、WebSocket技

如何利用JavaScript和WebSocket实现实时在线点餐系统 Dec 17, 2023 pm 12:09 PM

如何利用JavaScript和WebSocket实现实时在线点餐系统介绍：随着互联网的普及和技术的进步，越来越多的餐厅开始提供在线点餐服务。为了实现实时在线点餐系统，我们可以利用JavaScript和WebSocket技术。WebSocket是一种基于TCP协议的全双工通信协议，可以实现客户端与服务器的实时双向通信。在实时在线点餐系统中，当用户选择菜品并下单

如何使用WebSocket和JavaScript实现在线预约系统 Dec 17, 2023 am 09:39 AM

如何使用WebSocket和JavaScript实现在线预约系统在当今数字化的时代，越来越多的业务和服务都需要提供在线预约功能。而实现一个高效、实时的在线预约系统是至关重要的。本文将介绍如何使用WebSocket和JavaScript来实现一个在线预约系统，并提供具体的代码示例。一、什么是WebSocketWebSocket是一种在单个TCP连接上进行全双工

PHP与JS开发技巧：掌握绘制股票蜡烛图的方法 Dec 18, 2023 pm 03:39 PM

随着互联网金融的迅速发展，股票投资已经成为了越来越多人的选择。而在股票交易中，蜡烛图是一种常用的技术分析方法，它能够显示股票价格的变化趋势，帮助投资者做出更加精准的决策。本文将通过介绍PHP和JS的开发技巧，带领读者了解如何绘制股票蜡烛图，并提供具体的代码示例。一、了解股票蜡烛图在介绍如何绘制股票蜡烛图之前，我们首先需要了解一下什么是蜡烛图。蜡烛图是由日本人

JavaScript和WebSocket：打造高效的实时天气预报系统 Dec 17, 2023 pm 05:13 PM

JavaScript和WebSocket：打造高效的实时天气预报系统引言：如今，天气预报的准确性对于日常生活以及决策制定具有重要意义。随着技术的发展，我们可以通过实时获取天气数据来提供更准确可靠的天气预报。在本文中，我们将学习如何使用JavaScript和WebSocket技术，来构建一个高效的实时天气预报系统。本文将通过具体的代码示例来展示实现的过程。We

See all articles

js中数据类型，对象，构造函数详解

热AI工具

Undresser.AI Undress

AI Clothes Remover

Undress AI Tool

Clothoff.io

AI Hentai Generator

热门文章

热工具

记事本++7.3.1

SublimeText3汉化版

禅工作室 13.0.1

Dreamweaver CS6

SublimeText3 Mac版

热门话题