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Vue 'updated' 生命周期钩子


示例

使用 updated 生命周期钩子在每次 DOM 树更新时向控制台写入消息。

export default {
  data() {
    return {
      sliderVal: 50,
      renderCount: 0
    }
  },
  updated() {
    this.renderCount++;
    console.log('Updated ' + this.renderCount + ' times.')
  }
}
运行示例 »

定义和用法

The updated 生命周期钩子在 DOM 树更新之后立即发生。

如果我们在 updated 钩子中修改属性或执行其他触发新渲染的操作,updated 钩子将在该新渲染之后再次被调用,并且我们很可能创建了一个无限循环。

为了避免无限循环,我们应该始终考虑使用 beforeUpdate 生命周期钩子而不是 updated 生命周期钩子。

The this.$nextTick()nextTick() 函数也可以用来在 DOM 更新后运行代码。

注意: 在上面的示例中,我们将渲染计数写入控制台,因为对视图进行更改将重新激活 updated 钩子并创建一个无限循环。


相关页面

Vue 教程:Vue 生命周期钩子

Vue 教程:'beforeUpdate' 钩子

Vue 参考:Vue 'beforeUpdate' 生命周期钩子

Vue 参考:Vue $nextTick() 方法


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