Vue watch的immediate、deep怎么去理解?
时间: 2024-06-01 20:10:07 浏览: 95
immediate:
immediate为true时,表示在组件初始化时,立即执行一次watch的回调函数。如果不设置immediate,那么默认不会在组件初始化时执行回调函数。
deep:
deep为true时,表示深度观察,即侦听器会递归监听对象内部值的变化。如果对象内部还有对象,则需要设置deep为true才能监听到内部对象的变化。如果对象的层次结构很深,那么监听所有属性的变化可能会对性能造成影响,因此需要慎重考虑是否设置deep为true。
相关问题
vue3 watch immediate: true
在Vue 3中,使用`watch`来监听数据的变化。在`watch`中,可以通过设置`immediate: true`来在页面一开始加载时立即执行监听的回调函数。<em>1</em><em>2</em><em>3</em>
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vue3immediate
在Vue 3中,immediate是watch和watchEffect函数的一个配置选项。当immediate设置为true时,回调函数会在初始渲染时立即执行,而不仅仅是在被监听的值发生变化时执行。它可以用来处理初始渲染时需要执行的逻辑。例如,当监听一个状态变量时,immediate为true可以确保在组件初始渲染时执行一次回调函数,而不必等待状态变量的变化。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *2* [Vue3 学习总结笔记 (十三)](https://blog.csdn.net/IT_Holmes/article/details/126336582)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
- *3* [vue3 watch监听 (immediate / deep / watchEffect)](https://blog.csdn.net/Frazier1995/article/details/127490928)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
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