How to use JSON data in Vue

Vue is a popular JavaScript framework for building modern web applications. In Vue, we often need to use JSON data to store and transmit data, which is a very important topic. This article will introduce how to use JSON data in Vue.

What is JSON?

JSON is a lightweight data format commonly used to store and transmit structured data. It consists of key-value pairs, each separated by commas. The keys and values ​​are strings enclosed in double quotes, as follows:

{
"name": "John",
"age": 30,
"city" : "New York"
}

The JSON format is very simple and intuitive, easy to understand and parse, so it is widely used in web applications.

Using JSON data in Vue

JSON data can be used directly in Vue through data binding. Specifically, we can store the JSON data in the data object of the Vue instance and reference it using the {{}} syntax in the template.

For example, the following code shows how to use JSON data to render a list:

<template>
  <div>
    <ul>
      <li v-for="item in items">{{ item.name }} - {{ item.age }}</li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { name: 'John', age: 30 },
        { name: 'Mary', age: 25 },
        { name: 'Tom', age: 35 }
      ]
    }
  }
}
</script>

In this example, we use an array to store JSON objects, each JSON object contains Name and age attributes. We then use the v-for directive to iterate through the array and display the name and age of each JSON object using the {{}} syntax within the list items.

In addition, we can also process JSON data through Vue's calculated properties. Computed properties can calculate a new value based on the value provided by the JSON data and return it to the template.

For example, the following code shows how to use a computed property to calculate the average age of a JSON object:

<template>
  <div>
    <ul>
      <li v-for="item in items">{{ item.name }} - {{ item.age }}</li>
    </ul>
    <p>Average age: {{ averageAge }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      items: [
        { name: 'John', age: 30 },
        { name: 'Mary', age: 25 },
        { name: 'Tom', age: 35 }
      ]
    }
  },
  computed: {
    averageAge() {
      let sum = 0;
      for (let i = 0; i < this.items.length; i++) {
        sum += this.items[i].age;
      }
      return sum / this.items.length;
    }
  }
}
</script>

In this example, we define a computed property averageAge that iterates over the JSON array and Calculate their average age. Then, use the {{}} syntax in the template to reference the calculated property and display it on the page.

Summary

In Vue, using JSON data is very simple. We can store JSON data in a data object and use {{}} syntax to reference it in the template. Alternatively, we can use computed properties to process JSON data and calculate new values ​​based on the values ​​they provide. These technologies make it easier for Vue developers to process JSON data, thereby providing a better user experience in web applications.

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