How to use calculated properties in vue
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. This article mainly introduces the use of vue calculated attributes and method examples of vue instances. The editor thinks it is quite good. Now I will share it with you and give you a reference. I hope it can help everyone.
vue computed attribute
When we want to return the value of an attribute based on the execution result of one end of the business code, we can use the computed attribute 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>Set/get method of calculated attribute:
<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 Yes 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');Equivalent to:
var vm2 = new Vue({
el:'#box',
data:{},
methods:{}
});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.$log(); -> Check the current status of the data
Related recommendations:
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
AI Hentai Generator
Generate AI Hentai for free.
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
How to use DirectX repair tool? Detailed usage of DirectX repair tool
Mar 15, 2024 am 08:31 AM
The DirectX repair tool is a professional system tool. Its main function is to detect the DirectX status of the current system. If an abnormality is found, it can be repaired directly. There may be many users who don’t know how to use the DirectX repair tool. Let’s take a look at the detailed tutorial below. 1. Use repair tool software to perform repair detection. 2. If it prompts that there is an abnormal problem in the C++ component after the repair is completed, please click the Cancel button, and then click the Tools menu bar. 3. Click the Options button, select the extension, and click the Start Extension button. 4. After the expansion is completed, re-detect and repair it. 5. If the problem is still not solved after the repair tool operation is completed, you can try to uninstall and reinstall the program that reported the error.
CUDA's universal matrix multiplication: from entry to proficiency!
Mar 25, 2024 pm 12:30 PM
General Matrix Multiplication (GEMM) is a vital part of many applications and algorithms, and is also one of the important indicators for evaluating computer hardware performance. In-depth research and optimization of the implementation of GEMM can help us better understand high-performance computing and the relationship between software and hardware systems. In computer science, effective optimization of GEMM can increase computing speed and save resources, which is crucial to improving the overall performance of a computer system. An in-depth understanding of the working principle and optimization method of GEMM will help us better utilize the potential of modern computing hardware and provide more efficient solutions for various complex computing tasks. By optimizing the performance of GEMM
How to calculate addition, subtraction, multiplication and division in word document
Mar 19, 2024 pm 08:13 PM
WORD is a powerful word processor. We can use word to edit various texts. In Excel tables, we have mastered the calculation methods of addition, subtraction and multipliers. So if we need to calculate the addition of numerical values in Word tables, How to subtract the multiplier? Can I only use a calculator to calculate it? The answer is of course no, WORD can also do it. Today I will teach you how to use formulas to calculate basic operations such as addition, subtraction, multiplication and division in tables in Word documents. Let's learn together. So, today let me demonstrate in detail how to calculate addition, subtraction, multiplication and division in a WORD document? Step 1: Open a WORD, click [Table] under [Insert] on the toolbar, and insert a table in the drop-down menu.
Introduction to HTTP 525 status code: explore its definition and application
Feb 18, 2024 pm 10:12 PM
Introduction to HTTP 525 status code: Understand its definition and usage HTTP (HypertextTransferProtocol) 525 status code means that an error occurred on the server during the SSL handshake, resulting in the inability to establish a secure connection. The server returns this status code when an error occurs during the Transport Layer Security (TLS) handshake. This status code falls into the server error category and usually indicates a server configuration or setup problem. When the client tries to connect to the server via HTTPS, the server has no
How to use Baidu Netdisk-How to use Baidu Netdisk
Mar 04, 2024 pm 09:28 PM
Many friends still don’t know how to use Baidu Netdisk, so the editor will explain how to use Baidu Netdisk below. If you are in need, hurry up and take a look. I believe it will be helpful to everyone. Step 1: Log in directly after installing Baidu Netdisk (as shown in the picture); Step 2: Then select "My Sharing" and "Transfer List" according to the page prompts (as shown in the picture); Step 3: In "Friend Sharing", you can share pictures and files directly with friends (as shown in the picture); Step 4: Then select "Share" and then select computer files or network disk files (as shown in the picture); Fifth Step 1: Then you can find friends (as shown in the picture); Step 6: You can also find the functions you need in the "Function Treasure Box" (as shown in the picture). The above is the editor’s opinion
Learn to copy and paste quickly
Feb 18, 2024 pm 03:25 PM
How to use the copy-paste shortcut keys Copy-paste is an operation we often encounter when using computers every day. In order to improve work efficiency, it is very important to master the copy and paste shortcut keys. This article will introduce some commonly used copy and paste shortcut keys to help readers perform copy and paste operations more conveniently. Copy shortcut key: Ctrl+CCtrl+C is the shortcut key for copying. By holding down the Ctrl key and then pressing the C key, you can copy the selected text, files, pictures, etc. to the clipboard. To use this shortcut key,
What is the KMS activation tool? How to use the KMS activation tool? How to use KMS activation tool?
Mar 18, 2024 am 11:07 AM
The KMS Activation Tool is a software tool used to activate Microsoft Windows and Office products. KMS is the abbreviation of KeyManagementService, which is key management service. The KMS activation tool simulates the functions of the KMS server so that the computer can connect to the virtual KMS server to activate Windows and Office products. The KMS activation tool is small in size and powerful in function. It can be permanently activated with one click. It can activate any version of the window system and any version of Office software without being connected to the Internet. It is currently the most successful and frequently updated Windows activation tool. Today I will introduce it Let me introduce to you the kms activation work
How to merge cells using shortcut keys
Feb 26, 2024 am 10:27 AM
How to use the shortcut keys for merging cells In daily work, we often need to edit and format tables. Merging cells is a common operation that can merge multiple adjacent cells into one cell to improve the beauty of the table and the information display effect. In mainstream spreadsheet software such as Microsoft Excel and Google Sheets, the operation of merging cells is very simple and can be achieved through shortcut keys. The following will introduce the shortcut key usage for merging cells in these two software. exist
