How to write a normal loop in vue

Vue.js uses the v-for instruction in ordinary loops to traverse arrays or objects and create elements: Syntax: v-for="item in items", where items is the object to be traversed and item is the loop item . Example: Traverse the ['apple', 'banana', 'cherry'] array to generate a

list. In addition, you can also traverse { apple: 'red', banana: 'yellow', cherry: 'black' } objects. Special attributes: :key is used to specify a unique key, :index contains the index of the loop item. You can nest loops to

Usage of normal loops in Vue.js

In Vue.js, use The v-for directive iterates over an array or object and creates a corresponding number of elements. The ordinary loop syntax is as follows:

<code class="html"><ul>
  <li v-for="item in items">{{ item }}</li>
</ul></code>

Syntax:

• v-for="item in items": Define the object to be traversed by the loop (items) and loop items (item).
• {{ item }}: Render the content of the loop item within the loop body.

Example:

<code class="html"><!-- 遍历数组 -->
<ul>
  <li v-for="item in ['apple', 'banana', 'cherry']">{{ item }}</li>
</ul>

<!-- 遍历对象 -->
<ul>
  <li v-for="fruit in { apple: 'red', banana: 'yellow', cherry: 'black' }">{{ fruit }}</li>
</ul></code>

Special attributes:

• :key : Specify a unique key for each loop item, which is important for list operations and data tracking.
• :index: Contains the index of the loop item.

Nested Loops:

Loops can be nested together to traverse multidimensional data structures:

<code class="html"><ul>
  <li v-for="group in groups">
    <ul>
      <li v-for="student in group.students">{{ student }}</li>
    </ul>
  </li>
</ul></code>

Tips:

• Always provide a unique key for loop items.
• Make sure that the loop content does not change the loop items, otherwise it may cause unexpected behavior.
• You can use Vue.js filters to format or transform the contents of loop items.

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