$nextTick()
时间: 2023-10-17 16:23:11 浏览: 33
$nextTick() is a method provided by Vue.js that allows you to defer the execution of a function until the next DOM update cycle. This means that any changes made to the data in your Vue component will have been applied to the DOM before your function is executed.
This method is useful when you need to make changes to the DOM after a data change has been made in your component. For example, if you want to update the value of a computed property that depends on the DOM, you can use $nextTick() to ensure that the DOM has been updated before the property is calculated.
Here's an example of using $nextTick() to update a computed property:
```
<template>
<div>
<p>Count: {{ count }}</p>
<button @click="increment">Increment</button>
</div>
</template>
<script>
export default {
data() {
return {
count: 0
}
},
computed: {
computedCount() {
// Use $nextTick() to ensure that the DOM has been updated
this.$nextTick(() => {
console.log('DOM updated')
})
// Return the computed property value
return this.count * 2
}
},
methods: {
increment() {
this.count++
}
}
}
</script>
```
In this example, when the "Increment" button is clicked, the count data property is incremented and the computedCount computed property is recalculated. Using $nextTick() ensures that the DOM has been updated with the new count value before the computedCount property is calculated.