Which attribute of the selected object in vue

Vue is one of the most popular front-end JavaScript frameworks today. Its features such as data binding, componentization, and single-page application optimization are very attractive, attracting more and more developers to join its ecosystem. In the development of Vue, we often need to select a certain attribute of the object to operate. This article will share how to select the first attribute of an object in Vue.

There are many ways to select the properties of an object in Vue. Here are some practical methods:

1. Point identifier

Point identifier can access the object properties. For example, in Vue's <template> template, we can use the following syntax to access the name attribute of the user object:

<template>
  <div>
    <p>{{ user.name }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      user: { name: "张三", age: 20 },
    };
  },
};
</script>

2. Bracket identifier

Or use bracket identifier to access the properties of the object. For example, in Vue's template we can use the following syntax to access the name attribute of the user object:

<template>
  <div>
    <p>{{ user["name"] }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      user: { name: "张三", age: 20 },
    };
  },
};
</script>

This method is more suitable for attributes contained in the name variables.

3. v-for

In Vue’s v-for directive, we can use v-for="(item, index) in list" syntax to access list items and indexes. For example, we can use the following syntax to access the second property of each user in the users array:

<template>
  <div>
    <ul>
      <li v-for="(user, index) in users" :key="index">
        {{ user[1] }}
      </li>
    </ul>
  </div>
</template>

<script>
export default {
  data() {
    return {
      users: [
        { name: "张三", age: 20 },
        { name: "李四", age: 22 },
        { name: "王五", age: 25 },
      ],
    };
  },
};
</script>

In this example, we use v-for ="(user, index) in users" syntax to iterate over each user in the users array and access the second of each user object using user[1] attributes (that is, the age attribute).

4. Computed properties

In Vue’s calculated properties, we can use JavaScript syntax to select the properties of the object. For example, we can access the second property of object user using the following statement:

computed: {
  secondProperty() {
    return this.user[1];
  },
},

In this example, we define a computed property secondProperty, by return this.user[1]; The statement returns the second property of the object user, and uses the {{ secondProperty }} syntax in the template to display the The value of the attribute.

Summary

There are many ways to select the attribute of an object in Vue, including dot identifiers, bracket identifiers, v-for and calculated properties. Understanding the advantages, disadvantages and usage scenarios of these methods can help us handle data operations in Vue applications more efficiently.

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