v-model cannot be used on a prop, because local prop bindings are not writable. Use a v-bind binding combined with a v-on listener that emits update:x event instead.
时间: 2024-01-09 11:33:21 浏览: 58
Yes, you are correct. In Vue.js, the `v-model` directive is used to create two-way data bindings between form inputs and component data. However, it cannot be directly used on a prop because props are meant to be passed down from parent components and should not be modified directly within the child component.
To achieve a similar functionality, you can use a combination of `v-bind` and `v-on` directives. Instead of directly modifying the prop value, you can bind it to a local data property using `v-bind` and then emit an event using `v-on` to update the prop value in the parent component.
Here's an example of how you can achieve this:
```html
<template>
<div>
<input :value="localValue" @input="updatePropValue">
</div>
</template>
<script>
export default {
props: ['propValue'],
data() {
return {
localValue: this.propValue
};
},
methods: {
updatePropValue(event) {
this.localValue = event.target.value;
this.$emit('update:propValue', this.localValue);
}
}
};
</script>
```
In the above example, we bind the prop `propValue` to a local data property `localValue` using `:value="localValue"`. Then, when the input value changes, we update the `localValue` and emit an event using `this.$emit('update:propValue', this.localValue)`. This event can be listened to in the parent component and the prop value can be updated accordingly.
By using this approach, we achieve a similar two-way data binding effect while ensuring that props are not directly modified within the child component.