Summarize some storage methods of Vue.js

Vue.js is a popular JavaScript framework that includes many convenient tools to speed up development. Among them, its data storage method is very powerful and flexible. Here are some Vue.js storage methods.

1. data attribute storage

The data attribute of Vue.js is the main way to store data. When the component is mounted, Vue.js will bind the properties in data to the page. These properties are accessible through template syntax and can be accessed in JavaScript code using this.

For example, the following code defines a Vue.js component named App and stores a string named message in the data attribute:

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

<script>
export default {
  data() {
    return {
      message: 'Hello, Vue.js!'
    }
  }
}
</script>

In this example, When the component is mounted, Vue.js will automatically bind the message attribute to the template. So, the rendering result of the component will be a div element containing the text "Hello, Vue.js!"

2. Computed attribute storage

In addition to ordinary data attributes, Vue.js also provides computed attributes to store calculated attributes. The computed attribute can be calculated based on the value of one or more data attributes and the results can be cached.

For example, the following code defines a Vue.js component named App and stores a string named firstName and lastName in the data attribute, as well as a calculated property fullName:

<template>
  <div>
    {{ fullName }}
  </div>
</template>

<script>
export default {
  data() {
    return {
      firstName: 'John',
      lastName: 'Doe'
    }
  },
  computed: {
    fullName() {
      return `${this.firstName} ${this.lastName}`
    }
  }
}
</script>

In this example, the fullName attribute calculates a full name based on the values ​​​​of firstName and lastName, and caches the result. fullName is automatically recalculated whenever firstName or lastName changes.

3. methods attribute storage

The methods attribute of Vue.js can store a set of methods similar to functions. Unlike the data attribute and computed attribute, the methods in the methods attribute are usually used to handle user interaction events.

For example, the following code defines a Vue.js component named App and stores a method named greet in the methods attribute:

<template>
  <div>
    <button @click="greet">Greet!</button>
  </div>
</template>

<script>
export default {
  methods: {
    greet() {
      alert('Hello, Vue.js!')
    }
  }
}
</script>

In this example, when When the user clicks the button, Vue.js will call the greet method and pop up a dialog box containing the text "Hello, Vue.js!"

4. props attribute storage

The props attribute of Vue.js can store data from the parent component. When a component wants to display data in its parent component, it can use the props attribute to store the data.

For example, the following code defines a Vue.js component named MyButton and stores a string named text in the props attribute:

<template>
  <button>{{ text }}</button>
</template>

<script>
export default {
  props: {
    text: String
  }
}
</script>

In this example, The MyButton component can get a string named text from the parent component through the props attribute and display it in the button element. The parent component can use the MyButton component and set its props attribute as follows:

<template>
  <my-button text="Click me!"></my-button>
</template>

<script>
import MyButton from './MyButton.vue'

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

In this example, the parent component can pass a string named "Click me!" as the text attribute to the MyButton component. , and displays the MyButton component as a button with the text "Click me!"

Summary

Vue.js provides many ways to store data, including data attributes, computed attributes, methods attributes and props attributes. Mastering these methods can help us make better use of the convenient tools provided by Vue.js and achieve better development efficiency.

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