Solution to the variable responsive loss problem using reactive definition in vue3

When you say "variable responsive loss problem using reactive defined in vue3", here are some more specific examples and solutions:

1. Deconstruct responsive object properties

question:

import { reactive } from 'vue';  
const state = reactive({  
  count: 0  
});  

const { count } = state; // count is not responsive// Subsequent modifications to count will not trigger view updatecount = 1;

Solution:

• Always access properties through the original object, such as .
• If you need to deconstruct properties and keep them responsive, you can use toRefs:

import { reactive, toRefs } from 'vue';  
  
const state = reactive({  
  count: 0  
});  
const { count } = toRefs(state); // count is a responsive ref// Modifying the value of ref will trigger view update = 1;

2. Add new attributes to responsive object

question:

import { reactive } from 'vue';  
  
const state = reactive({  
  // Initial properties});  
  
// Add new attributes later = 'value'; // The view may not be updated

Solution:

• Vue 3 uses Proxy, so in most cases adding new properties directly should make the view update. But if you encounter problems, make sure no other code covers the new properties.
• If the problem persists, you can try it (although it is not usually needed in Vue 3, as Proxy has handled most of the cases).

3. Asynchronously update the responsive state

question:

import { reactive } from 'vue';  
  
const state = reactive({  
  data: null  
});  
// Define a responsive variableconst data = reactive ({
        name:"",
        age:""
});

async function fetchData() {  
  const response = await fetch(/* ... */);  
  const res = await ();  
   = ; // The view may not be updated immediately  // Direct assignment  data = ;// Responsive missing, view not updated  }

Solution:

• Make sure that the status is updated only after the asynchronous operation is completed. In the example above, = data; should be able to trigger view updates.
• If the view is not updated, checking for additional code (such as computed properties or listeners) may prevent the update.

import { reactive } from 'vue';  
// Define a responsive variableconst data = reactive ({
    dataObj:{
        name:"",
        age:""
    }
});
// or// Define a responsive variableconst data1 = ref ({
    name:"",
    age:""
});

async function fetchData() {  
  const response = await fetch(/* ... */);  
  const res = await ();  
  // Nested a layer of dataObj  = ; // Keep responsive, view update  // Update the value of the responsive variable   = ; // Keep responsive, view update  }

4. Summary

When encountering responsive loss, the first thing to check is whether you are using Vue's responsive system correctly. Make sure you have not overridden or deconstructed responsive properties incorrectly and that your asynchronous operations and data update logic is correct. If the problem persists, use Vue Devtools to help you debug and find the root cause of the problem.

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