VUE3 Quick Start: How to use templates

With the continuous updating of front-end technology, there are more and more front-end frameworks. As one of the well-known JavaScript frameworks, Vue.js has received widespread attention and favor in terms of readability, maintainability, and development efficiency. Vue3 is the latest version of Vue.js. This article will introduce you to how to use Vue3 templates to get started quickly.

1. Basic concepts of Vue3

Before using Vue3, you first need to understand some related basic concepts. Vue3 is mainly composed of the following parts:

1. Core library (core): Provides core functions such as Vue instantiation and responsive data.

2. Component library (composition): Provides a combination API to make component logic encapsulation more convenient.

3. Routing library (router): Provides routing solutions.

4. State management library (store): Provides global state management.

2. Vue3 template syntax

When developing using Vue3, we usually need to write templates to describe our views. Template syntax is a very important part of Vue3. It can easily describe UI components, and can also perform data binding, conditional rendering, list rendering and other operations. The following are some common examples of Vue3 template syntax:

1. Interpolation expression (Interpolation)

Vue3 uses {{}} to perform interpolation operations. For example, we need to display the value of a variable message on the web page, which can be achieved through the following code:

<template>
    <div>{{ message }}</div>
</template>

<script>
export default {
    data(){
        return {
            message: 'Hello Vue3!'
        }
    }
}
</script>

2. Directives

Directives are one of the core parts of Vue3 template syntax. It can be used to complete a variety of functions, such as conditional rendering, property binding, event binding, list rendering, etc. For example, if we need to decide whether to display an element based on a variable, we can use the v-if instruction:

<template>
    <div v-if="isShow">{{ message }}</div>
    <button @click="toggleShow">Toggle Show</button>
</template>

<script>
export default {
    data(){
        return {
            message: 'Hello Vue3!',
            isShow: true
        }
    },
    methods:{
        toggleShow(){
            this.isShow = !this.isShow;
        }
    }
}
</script>

In addition, Vue3 also provides the v-for instruction to implement list rendering. For example:

<template>
    <ul>
        <li v-for="(item,index) in list" :key="index">{{ item.title }}</li>
    </ul>
</template>

<script>
export default {
    data(){
        return {
            list:[
                { title:'Apple' },
                { title:'Banana' },
                { title:'Cherry' }
            ]
        }
    }
}
</script>

In addition, there are many other command functions that can be used to meet the needs of different scenarios.

3. Use Vue3 to create components

Creating components in Vue3 is very simple. You only need to define a template and a JavaScript file. The following is a simple component example:

// MyComponent.vue

<template>
    <div>
        <h1>{{ title }}</h1>
        <button @click="clickHandler()">Click Me</button>
    </div>
</template>

<script>
export default {
    data(){
        return {
            title: 'My Component'
        }
    },
    methods:{
        clickHandler(){
            console.log('Click Me');
        }
    }
}
</script>

The above code defines a component named MyComponent. The template contains a title and a button. When the button is clicked, "Click Me" will be printed. Using this component in the application is very simple, just import it in other components:

// App.vue

<template>
    <div>
        <my-component></my-component>
    </div>
</template>

<script>
import MyComponent from './MyComponent.vue';

export default {
    components:{
        MyComponent
    }
}
</script>

In the above code, we first import MyComponent into App.vue, and then declare it in the components option, You can use the MyComponent component in the template. In actual development, we can create different components according to business needs and then combine them together to form a complete application.

4. Conclusion

This article introduces the basic concepts and template syntax of Vue3, and how to use Vue3 to create components. I believe there are many advanced techniques of Vue3 that have not been covered. When using Vue3 for development, you need to continuously understand its internal mechanisms and make appropriate adjustments based on actual business needs.

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