Let's talk about how to use Vue.js to get values ​​on the page

Vue.js is a lightweight front-end framework that is easy to learn and use, component-based, efficient, and flexible, so it is very popular in front-end development. When using Vue.js, we often need to pass data to the page and obtain the data entered by the user on the web page. In this article, we will discuss how to get a value on a page using Vue.js.

1. Data binding of Vue.js

Vue.js realizes automatic updating of data and page elements through data binding. For example, when defining data in a Vue instance, we can use double curly braces {{}} to bind the data to elements on the web page. When the data changes, the page elements will automatically update. For example, the following code binds the message data in the Vue instance to an element on the web page.

<div id="app">
  <p>{{ message }}</p>
</div>

var app = new Vue({
  el: '#app',
  data: {
    message: 'Hello Vue!'
  }
})

In the above example, we defined a Vue instance and defined a message data in the instance. On the web page, we bind the data to a p tag and set its initial value to 'Hello Vue!'. When this data changes, the element on the page automatically updates.

2. Vue.js instructions

Vue.js instructions are used to add more interactive behaviors when binding data. Including v-if, v-for, v-show, etc., Vue.js instructions can help us implement more functions on the page. Vue.js's v-model directive is very powerful when it comes to getting values.

1. Basic usage of v-model directive

In Vue.js, the v-model directive is used to create two-way data binding between form elements and data. For example, we often need to obtain data entered by users on web pages, and v-model can simplify this process. The following code demonstrates how to use the v-model directive to obtain the value of an input element in Vue.js.

<div id="app">
  <input v-model="message" type="text">
  <p>{{ message }}</p>
</div>

var app = new Vue({
  el: '#app',
  data: {
    message: ''
  }
})

In the above code, we define an input box and a p tag. Use the v-model directive to bind data to the input box. When the user enters content in the input box, the data is automatically updated and updated to the p tag on the page through the data binding mechanism of Vue.js.

2. Modifiers of the v-model directive

In Vue.js, the v-model directive can also use modifiers. Commonly used modifiers include: .lazy, .number, .trim, etc. For example, when we obtain user input, we can use the .trim modifier to remove the spaces entered, as shown below:

<div id="app">
  <input v-model.trim="message" type="text">
  <p>{{ message }}</p>
</div>

In the above code, use the .trim modifier to remove the spaces entered by the user, and Assign the result to the message data in the Vue instance.

3. Summary

In Vue.js, obtaining values ​​usually uses data binding and v-model instructions. Data binding is used to implement automatic updates on the page while simplifying the operation of getting values. The v-model directive is a powerful tool for creating two-way data binding between form elements and data. Modifiers can handle user input more flexibly. Mastering these Vue.js skills, I believe it will help you develop front-end pages more efficiently.

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