What does v-for in vue mean?

v-for directive is used in Vue to iterate over an array or object and render HTML for each element, creating a dynamic list. It uses the syntax v-for="item in items", where item is the alias and items is the array or object to be iterated over. v-for can iterate over an array to create an unordered list, or over an object to create a paragraph list. Note: The item alias can only be used within the instruction block. You can use the track-by and v-key attributes to optimize performance.

The meaning of v-for in Vue

v-for is the meaning of Vue Instructions used to iterate over an array or object and render HTML for each element. It allows you to create dynamic lists where each element has its own data and behavior.

Syntax

<code class="html"><template v-for="item in items">
  <!-- 每个元素的 HTML -->
</template></code>

Where:

• v-for is the instruction name.
• item is an alias for each element in the array or object to be iterated over.
• items is the array or object to be traversed.

Usage

v-for The most common use of the v-for

directive is to iterate over an array:

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

This will create An unordered list in which each list item contains the corresponding element in the array items.

In addition to arrays, v-for

can also be used to iterate over objects:

<code class="html"><div>
  <p v-for="value in object">{{ value }}</p>
</div></code>

This will create a list of paragraphs, each of which contains objects The corresponding value in object.

Note

• #item
Alias ​​can only be used within the instruction block.
• The attribute used to track the element's identity can be specified using the track-by attribute of v-for
.
• You can use the v-key
attribute to set a unique key for each element in the list.

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