The role of mounted in vue

Vue.js life cycle hook mounted is triggered when the component is first mounted to the DOM and is used to: 1. Obtain DOM element references; 2. Perform initial settings; 3. Ensure DOM stability; 4. Perform asynchronous Task.

The role of mounted in Vue

mounted is one of the Vue.js life cycle hooks. It is used when the component is first mounted. Triggered when loaded into DOM. This means that the component has been initialized, template compiled and rendered, and added to the DOM tree.

The role of mounted

The main purpose of the mounted hook is:

• Get the DOM element reference:Passthis.$el Access the root DOM element of the component, allowing interaction and manipulation with the DOM within the component.
• Perform initial setup: Complete tasks that need to be performed immediately after the component is mounted to the DOM, such as binding event listeners, setting data state, or performing external API calls.
• Ensure DOM stability: Because the component is stably added to the DOM during the mounted stage, operations that rely on the DOM structure, such as DOM queries, animations, and scrolling, can be safely performed.
• Perform asynchronous tasks: The mounted stage is ideal for performing asynchronous tasks that may take a while to complete, such as loading external resources or making network requests.

When to use mounted

Generally, use the mounted hook when:

• Need to access the DOM element of the component
• Need to initialize data or state after the component is mounted
• Need to perform network requests or asynchronous tasks after the component is mounted
• Need to ensure that DOM operations are only performed after the component is mounted Executed when reaching the DOM

Example

The following is an example of the mounted hook:

<code class="js">export default {
  mounted() {
    // 获取根 DOM 元素的引用
    console.log(this.$el);

    // 初始化组件状态
    this.count = 0;

    // 绑定事件监听器
    this.$el.addEventListener('click', this.incrementCount);
  },
  methods: {
    incrementCount() {
      // 每次单击按钮时增加计数器
      this.count++;
    }
  }
};</code>

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