How to use nexttick in vue

nextTick in Vue.js is an asynchronous method used to execute the callback function in the next event loop. Mainly used to update component status after asynchronous operations, such as updating status in callback functions, updating status in watch listeners, and updating status in life cycle hooks.

Usage of nextTick in Vue.js

1. What is nextTick?

nextTick in Vue.js is an asynchronous method that adds a callback function to the queue and executes the callback function on the next event loop.

2. Usage of nextTick

The syntax of nextTick is as follows:

<code class="javascript">Vue.nextTick(callback)</code>

Among them, callback is an event that will occur in the next event The callback function executed in the loop.

The following is an example of using nextTick:

<code class="javascript">Vue.nextTick(() => {
  console.log("这个回调将在下一个事件循环中执行");
});</code>

3. Purpose of nextTick

nextTick is mainly used to update Vue.js after asynchronous operations The state of the component. For example:

• Update state in the callback function: After the Ajax request returns, use nextTick to update the component state to ensure that the data is displayed correctly before the DOM is updated.
• Update status in the watch listener: In the watch listener, use nextTick to update the status associated with the listened property to avoid Infinite loop.
• Update status in life cycle hooks: In life cycle hooks such as mounted or updated, use nextTick to update component status to Make sure to do it correctly before updating the DOM.

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