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This article mainly introduces vue how to observe arrays and objects, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Observe arrays and objects

The trickiest part of using the observer is that sometimes it doesn't seem to trigger correctly. It's usually because you're trying to view an array or an object, but you don't set deep to true:

Export default {name: 'ColourChange', props: {colours: {type: Array, required: true,},}, watch: {/ / use object syntax instead of just method colours: {/ / this will let Vue know to look inside the array deep: true / / We must move our method to the handler field handler () console.log ('color list has changed!') ;}

Reactive API with Vue 3 looks like this:

Watch (colours, () = > {console.log ('Color list changed!') ;}, {deep: true,}) Thank you for reading this article carefully. I hope the article "how vue observes arrays and objects" shared by the editor will be helpful to you. At the same time, I also hope you will support us and pay attention to the industry information channel. More related knowledge is waiting for you to learn!

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