What is the difference between v-if and v-show in vue

In Vue.js, v-if and v-show are both conditional rendering instructions, but they have the following differences: v-if will remove elements, while v-show only hides elements; v- if affects the DOM structure, while v-show only affects the display state; v-if has a larger performance overhead, while v-show is smaller; v-if is used to dynamically create or destroy elements, while v-show is used to switch the display state.

The difference between v-if and v-show in Vue

In Vue.js, v-if and v-show are conditional rendering instructions for dynamically showing or hiding elements. However, they have different differences in implementation and behavior:

1. Rendering method

• v-if:When When the condition is false, v-if removes the element and all its children.
• v-show: When the condition is false, v-show only hides the element without removing it.

2. DOM influence

• v-if: will affect the DOM structure, adding or moving when conditions change Remove elements.
• v-show: Only affects the display state of the element and does not change the DOM structure.

3. Performance impact

• v-if: When conditions change frequently, removing and adding elements may Will cause large performance overhead.
• v-show: Since the DOM structure is not modified, the performance impact is small.

4. Usage scenarios

• v-if：

  • Used to dynamically create or destroy elements based on conditions.
  • There is no need to retain the state of the element when the conditions change.

• v-show:

  • is used to dynamically switch the display state of elements based on conditions.
  • When the conditions change, the state of the element needs to be preserved (for example, form input value).

Summary

v-if and v-show are functionally similar instructions in Vue.js, but they are used in rendering There are different differences in methods, DOM impact, performance and usage scenarios. Choosing the appropriate directive depends on your application's needs and performance considerations.

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