How to use change in vue

In Vue.js, the change event is used to listen for changes in element values, such as <input> or <select> elements. Usage: Use the v-on:change directive to listen to the change event and specify a Vue.js method as a parameter that will be called when the element value changes. Event details include the element that triggered the event, the new value, and the old value.

change event in Vue.js

Answer: change event is used to listen for elements Change of value (such as <input> or <select>), triggered when the value in the element changes.

Detailed expansion:

Usage:

In Vue.js, use v-on:change directive to listen for change events. For example:

<code class="html"><input v-on:change="handleChange"></code>

Parameters:

handleChange is a Vue.js method that is called when the element value changes. This method can receive a parameter event, which contains details about the event.

Event details:

event The object contains the following information about the event:

• target: The element that triggered the event
• value: The new value of the element
• oldValue: The old value of the element

Example:

A simple example showing how to use the change event to listen for changes in the value of an input element:

<code class="html"><template>
  <input v-on:change="handleChange">
</template>

<script>
export default {
  methods: {
    handleChange(event) {
      console.log(`新值：${event.target.value}`);
    }
  }
}
</script></code>

When When the user changes the value in the input element, the handleChange method is called and prints the new value in the console.

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