How to use calculated properties in vue
This article mainly introduces the use of vue computed properties and method examples of vue instances. The editor thinks it is quite good. Now I will share it with you and give it a reference. Let’s follow the editor and take a look.
This article introduces the use of vue calculated properties and examples of methods of vue instances. I would like to share them with you. The details are as follows:
Computed properties
Expressions are very convenient in templates, but they are really only used for simple operations. Templates are used to describe the structure of views. Putting too much logic into a template can make it overweight and difficult to maintain. That's why Vue.js limits binding expressions to one expression. If the logic of more than one expression is required, computed properties should be used.
vue computed properties
When we want to return the value of a property based on the execution result of one end of the business code, we can use the computed property computed,
Computed property is a function with results. It has get method and set method. The get method must have a return value and must have a return value.
<script src="lib/vue.js"></script> <body> <p id="box"> a = >{{a}} b = > {{b}} </p> </body> <script> var vm = new Vue({ el:'#box', data:{ a:1 }, computed:{ b:function () { //业务代码 return this.a+1; } } }); /**这样直接改属性的值不行的,需要调用计算属性的set方法**/ document.onclick = function(){ vm.b = 3; }; </script>
The set/get method of calculated property:
<script src="lib/vue.js"></script> <body> <p id="box"> a = >{{a}} b = > {{b}} </p> </body> <script> var vm = new Vue({ el:'#box', data:{ a:1 }, computed:{ b:{ get:function () { return this.a+1; }, set:function(val){ this.a = val; } } } }); /**这样直接改属性的值不行的,需要调用计算属性的set方法**/ document.onclick = function(){ vm.b = 3; //默认调用计算属性的set方法 }; </script>
Simple method of vue instance
vm is the name of the created vue instance object
vm.$el -> is the element
vm. $data -> is data
vm.$mount -> Mount the vue object on the node object
For example:
var vm2 = new Vue({ data:{}, methods:{} }).$mount('#box');
is equivalent to:
var vm2 = new Vue({ el:'#box', data:{}, methods:{} });
vm.$options -> Get custom properties, custom methods
Vue instances can customize properties and methods. If you need to call them, you need to call $options. For example:
var vm2 = new Vue({ aa:'1',//自定义属性 show:function () { alert(1); }, el:'#box', data:{}, methods:{} }); vm2.$options.show(); console.log(vm2.$options.aa);
vm.$destroy -> Destroy the object
vm.$log(); -> Check the current status of the data
The above is what I compiled for everyone, I hope It will be helpful to everyone in the future.
Related articles:
How to use the swiper component to implement image switching display in WeChat Mini Program
How to implement circular advertising in javascript Article
About the debugging tool vue-devtools (detailed tutorial) in Vue
The above is the detailed content of How to use calculated properties in vue. For more information, please follow other related articles on the PHP Chinese website!

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

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

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

Hot Topics

Vue.js is suitable for small and medium-sized projects and fast iterations, while React is suitable for large and complex applications. 1) Vue.js is easy to use and is suitable for situations where the team is insufficient or the project scale is small. 2) React has a richer ecosystem and is suitable for projects with high performance and complex functional needs.

You can add a function to the Vue button by binding the button in the HTML template to a method. Define the method and write function logic in the Vue instance.

Vue multi-page development is a way to build applications using the Vue.js framework, where the application is divided into separate pages: Code Maintenance: Splitting the application into multiple pages can make the code easier to manage and maintain. Modularity: Each page can be used as a separate module for easy reuse and replacement. Simple routing: Navigation between pages can be managed through simple routing configuration. SEO Optimization: Each page has its own URL, which helps SEO.

There are two ways to jump div elements in Vue: use Vue Router and add router-link component. Add the @click event listener and call this.$router.push() method to jump.

Netflixusesacustomframeworkcalled"Gibbon"builtonReact,notReactorVuedirectly.1)TeamExperience:Choosebasedonfamiliarity.2)ProjectComplexity:Vueforsimplerprojects,Reactforcomplexones.3)CustomizationNeeds:Reactoffersmoreflexibility.4)Ecosystema

The methods to implement the jump of a tag in Vue include: using the a tag in the HTML template to specify the href attribute. Use the router-link component of Vue routing. Use this.$router.push() method in JavaScript. Parameters can be passed through the query parameter and routes are configured in the router options for dynamic jumps.

Vue component passing values is a mechanism for passing data and information between components. It can be implemented through properties (props) or events: Props: Declare the data to be received in the component and pass the data in the parent component. Events: Use the $emit method to trigger an event and listen to it in the parent component using the v-on directive.

Netflix mainly uses React as the front-end framework, supplemented by Vue for specific functions. 1) React's componentization and virtual DOM improve the performance and development efficiency of Netflix applications. 2) Vue is used in Netflix's internal tools and small projects, and its flexibility and ease of use are key.
