This article mainly introduces Vue to implement library management, shares the knowledge points used in the library management demo, and summarizes the problems encountered. It has certain reference value. Interested friends can refer to it. I hope it can help everyone. .
The company's projects in the future require the use of vue.js knowledge. I have not learned it in Angular. I only know a little bit about node.js and react, so it is difficult to learn it. If you want to learn vue.js knowledge, the recommended website: http://vuejs.org/
The details are as follows:
1. Knowledge points for library management demo
1. bootstrap: http://getbootstrap.com/
2. vuejs: http://getbootstrap.com/
The specific code is as follows:
html part
<p id="app" class="container"> <table class="table table-bordered"> <p v-for = "book in books"> <tr> <th>书名</th> <th>书的价格</th> <th>书的数量</th> <th>小计</th> <th>操作</th> </tr> <tr v-for = "(index,book ) in books"> <td>{{book.name}}</td> <td>{{book.price}}</td> <td><button @click="book.count&&book.count--">-</button><input type="text" v-model="book.count" /><button @click="book.count++">+</button></td> <td>{{book.price*book.count}}</td> <td><button class="btn btn-danger" @click="deleteBook(book)">删除</button></td> </tr> <tr> <td colspan="5"> 总价{{total}} </td> </tr> </p> </table> <p class="form-group"> <label for="bookname" id="bookname">书名</label> <input type="text" v-model="list.name" class="form-control"/> </p> <p class="form-group"> <label for="bookprice" id="bookprice">价格</label> <input type="text" v-model="list.price" class="form-control"/> </p> <p class="form-group"> <label for="bookcount" id="bookcount">数量</label> <input type="text" v-model="list.count" class="form-control"/> </p> <p class="form-group"> <button class="btn btn-primary" @click="add">添加</button> </p> </p>
script part
<script src="js/vue.js"></script> <script> var vm = new Vue({ el:"#app", data:{ books:[ {name:'VUE js',price:40,count:1}, {name:'NODE js',price:20,count:1}, {name:'REACT js',price:30,count:1}, {name:'ANGULAR js',price:100,count:1}, {name:'JQUERY js',price:50,count:1}, ], list:{ name:'', price:'', count:'' } }, methods:{ deleteBook(book){ // vue 给我们提供了一个 $remove的方法,在数组中删除 this.books.$remove(book); /*this.books = this.books.filter((item)=>{ return item != book })*/ }, add(){ this.books.push(this.list); this.list = { name:'', price:'', count:'' } } }, computed:{ total(){ var sum = 0; this.books.forEach(item =>{ sum += item.price*item.count; }) return sum; } } }); </script>
Summary of difficulties encountered
When the quantity is less than 0, there are many judgment methods and solutions. The following summarizes 3 methods
(1) The simplest method
Based on logical judgment, pay attention to the order of logical judgment here, the code is as follows:
Copy code The code is as follows:
(2) Pay attention here this points to the question
Copy code The code is as follows:
methods:{ min(index){ if(this.books[index].count>0){ this.books[index].count = parseInt(this.books[index].count) - 1; } }, deleteBook(book){ // vue 给我们提供了一个 $remove的方法,在数组中删除 this.books.$remove(book); /*this.books = this.books.filter((item)=>{ return item != book })*/ }, add(){ this.books.push(this.list); this.list = { name:'', price:'', count:'' } } }
(3) Parameter passing problem during v-on execution
Copy code The code is as follows:
min(book){ if(book.count>0){ book.count = parseInt(book.count) - 1; } }
Summary:
When v-on needs to pass parameters when executing a method, add (). If you don’t need to pass parameters, you don’t need to add ().
If you need to pass parameters, we You need to manually pass in the event source
Related recommendations:
Detailed steps for creating a book management platform using vue.js
Library management system source code php generates random verification code image code
Node.js close to actual combat (2) book management system_html/css_WEB-ITnose
The above is the detailed content of Vue implementation of book management examples. For more information, please follow other related articles on the PHP Chinese website!

JavaScript's application in the real world includes front-end and back-end development. 1) Display front-end applications by building a TODO list application, involving DOM operations and event processing. 2) Build RESTfulAPI through Node.js and Express to demonstrate back-end applications.

The main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.

Understanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.

Python is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.

Python and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.

The shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.

Different JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.

JavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SublimeText3 Linux new version
SublimeText3 Linux latest version

Dreamweaver Mac version
Visual web development tools

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment

SecLists
SecLists is the ultimate security tester's companion. It is a collection of various types of lists that are frequently used during security assessments, all in one place. SecLists helps make security testing more efficient and productive by conveniently providing all the lists a security tester might need. List types include usernames, passwords, URLs, fuzzing payloads, sensitive data patterns, web shells, and more. The tester can simply pull this repository onto a new test machine and he will have access to every type of list he needs.

SublimeText3 Mac version
God-level code editing software (SublimeText3)