What values ​​are there in vue's data?

Vue.js is a front-end framework for building user interfaces that uses data-driven management of application state and page components. In Vue, data is stored in an object named data, which contains the application's state and responsive properties. Through the properties in the data object, Vue implements data binding and responsive rendering. So, what values ​​are there in the data object? This article will introduce you one by one.

1. Boolean data

data object can contain Boolean data, for example:

data () {
  return {
    isShow: true,
    isLogin: false
  }
}

Two Boolean type variables isShow and isLogin are defined here , used to control the display and hiding in the page and the user's login status. When using these variables in a template, you can control the display and hiding of elements based on the value of the variable through the v-if and v-show directives.

2. Numeric data

data objects can also contain numeric data, for example:

data () {
  return {
    count: 0,
    price: 120.5
  }
}

Two numeric type variables count are defined here and price, used to record quantity and price respectively. When using these variables in a template, operations and formatted output can be performed, for example:

<div>数量：{{ count }}</div>
<div>价格：{{ price.toFixed(2) }}</div>

3. String data

data objects can also contain string types Data, for example:

data () {
  return {
    title: 'Vue 的 data 对象',
    message: '欢迎来到我的博客！'
  }
}

Two string type variables title and message are defined here, which are used to display the page title and welcome message. When using these variables in a template, the value of the variable can be rendered onto the page via the interpolation expression {{}}.

4. Object type data

data The object can also contain object type data, for example:

data () {
  return {
    user: {
      name: 'Tom',
      age: 25,
      gender: '男'
    }
  }
}

A user object is defined here, including The user's name, age and gender. When using these object properties in a template, they can be accessed through dots or square brackets, for example:

<div>{{ user.name }}</div>
<div>{{ user['age'] }}</div>

5. Array type data

data The object can also contain array types Data, for example:

data () {
  return {
    items: ['苹果', '香蕉', '橙子']
  }
}

An items array is defined here, including three types of fruits. When using these array elements in the template, you can traverse and render them through the v-for instruction, for example:

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

The above are the various data types that can be contained in the data object in Vue. By combining these data reasonably types to build more complex and rich applications. At the same time, when using data objects, you also need to pay attention to their scope and life cycle to avoid unnecessary problems.

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