Vue3 responsive advanced usage of toRaw

1. Introduction

In Vue3, a responsive system is one of its core features. passreactiveandref, we can easily create responsive data objects, thus enabling data-driven view updates. However, sometimes we need to access the original values ​​of these responsive objects, at which pointtoRawThe method comes in handy. This article will discuss in depthtoRawand its application scenarios.

2. Use scenarios

2.1 Performance optimization

Frequent responsive updates can cause performance problems when dealing with large data structures. passtoRaw, We can bypass Vue's responsive system and trigger updates only when necessary, thereby improving performance.

2.2 Integration with external libraries

Sometimes, we need to pass Vue's responsive objects to external libraries that do not support responsive systems. In this case, it is possible to usetoRawGet the original object to ensure compatibility with external libraries.

3. Basic use

3.1 Creating Responsive Objects

First, we usereactiveCreate a responsive object:

<script lang="ts" setup>
  import { reactive } from 'vue';

  const state = reactive({ count: 0 });
</script>

3.2 Get the original object

Next, we usetoRawGet the original value of the responsive object:

<script lang="ts" setup>
  import { toRaw } from 'vue';

  const rawState = toRaw(state);
</script>

3.3 Modify the original object

Modifying the original object will not trigger responsive updates:

<script lang="ts" setup>
   = 10;
  (); // Output 0, because state is a responsive proxy and has not been modified</script>

4. Detailed explanation of functions

4.1 toRawHow it works

toRawMethods are used to obtain thereactiveorrefThe original value of the responsive proxy object created. Vue creates these proxy objects internally to track property changes and trigger view updates. However, throughtoRaw, we can access non-responsive versions of these objects.

4.2 Precautions for use

• usetoRawThe obtained original object will no longer be responsive.
• Modifying the original object does not trigger view updates.
• toRawSuitable for performance optimization and integration with external libraries.

V. Best practices and cases

5.1 Performance optimization case

Suppose we have a large data structure that requires frequent batch updates. To avoid unnecessary view updates, you can usetoRaw：

<script lang="ts" setup>
  import { reactive, toRaw } from 'vue';

  const largeData = reactive({ items: new Array(1000).fill(0) });

  const rawData = toRaw(largeData);

  // Batch update  for (let i = 0; i < ; i++) {
    [i] = i;
  }

  // Because the original object is used, the view will not be rerendered every time it is updated  ([0]); // Output 0</script>

5.2 Integration cases with external libraries

Suppose we need to pass responsive objects to an external library that does not support responsive systems:

<script lang="ts" setup>
  import { reactive, toRaw } from 'vue';
  import externalLibrary from 'external-library'; // Assume this is an external library
  const state = reactive({ count: 0 });

  // Get the original object  const rawState = toRaw(state);

  // Pass the original object to the external library  (rawState);
</script>

6. Summary

toRawIt is a very practical and advanced usage in Vue3 that can help us bypass responsive systems in specific scenarios, thereby optimizing performance or better integrating with external libraries. Through the introduction of this article, I hope readers can better understand and apply ittoRaw, thereby gaining more flexibility and performance improvements in actual projects.

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