How to get data value in vue

Vue.js is a popular JavaScript framework that is widely used in the field of front-end development. In Vue, obtaining data values ​​is a very important concept. Vue provides a series of methods to get data values, including getting the value in data, getting the value in computed, and getting the value in props. In this article, we will detail these methods of obtaining data values.

1. Get the value in data

In the Vue instance, we can access the data object through this.$data. For example:

<template>
  <div>
    <p>{{msg}}</p>
    <button @click="getData">获取数据</button>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      msg: 'Hello World!'
    }
  },
  methods: {
    getData() {
      console.log(this.$data.msg)
    }
  }
}
</script>

In the above code, we define the msg attribute in data and access it through this.$data.msg. In this way, we can get all attribute values ​​​​in the data object.

2. Get the value in computed

Computed is a very useful concept in Vue. A computed property is reactive and is automatically recalculated when the properties it depends on change. When getting the values ​​of computed properties, we can access them directly. For example:

<template>
  <div>
    <p>{{msg}}</p>
    <button @click="getData">获取数据</button>
  </div>
</template>
 
<script>
export default {
  data() {
    return {
      name: 'Lucy',
      age: 18
    }
  },
  computed: {
    msg() {
      return `我的名字是${this.name}，我今年${this.age}岁了。`
    }
  },
  methods: {
    getData() {
      console.log(this.msg)
    }
  }
}
</script>

In the above code, we define a computed attribute msg, which is used to calculate a string. We access the value of this calculated property directly through this.msg.

3. Get the value in props

When using Vue to develop a component, we can define the props attribute in the component and pass data through it. When getting the value in props, we can access it directly through the props object. For example:

<template>
  <div>
    <p>{{msg}}</p>
  </div>
</template>
 
<script>
export default {
  props: {
    name: String,
    age: Number
  },
  computed: {
    msg() {
      return `我的名字是${this.name}，我今年${this.age}岁了。`
    }
  }
}
</script>

In the above code, we defined two props attributes name and age, which are string and numeric types respectively. We access their values ​​through this.name and this.age.

4. Summary

In Vue, obtaining data values ​​is a very important concept. We can access all property values ​​in the data object through this.$data, obtain the value of the calculated property by directly accessing the computed property, and obtain the data passed by the parent component through the props object. These methods can help us obtain data values ​​more conveniently and make front-end development more efficient.

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