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

The main difference between v-show and v-if in Vue is: v-show: controls the display of elements by changing the display style attribute, lightweight, and performance-friendly for elements that frequently switch to display/hide; but Will preserve the space occupied by the element, which may cause flickering. v-if: Insert or delete elements through conditions, affecting the layout flow and avoiding flickering; however, the cost of destroying and re-creating elements is high, and it is not suitable for frequently switching displayed/hidden elements.

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

In Vue.js, v-show and v-if are instructions used to conditionally render elements. However, there are significant differences in how they work and their performance impact.

v-show

• Dynamicly change the display style attribute of an element.
• When the v-show expression of an element is true, the element will be displayed; when it is false, the element will be hidden.
• Elements will not be destroyed and recreated.

Advantages:

• The performance overhead is lower because elements do not need to be destroyed and recreated.
• Better used for elements that need to be frequently switched to show/hide.

Disadvantages:

• Cannot affect the layout flow of DOM nodes because hidden elements still occupy space.
• May cause flickering because element changes are done via CSS transitions.

v-if

• Use the if statement to conditionally insert or delete elements.
• When the v-if expression of an element is true, the element will be inserted; when it is false, the element will be deleted.
• Destroy and recreate elements.

Advantages:

• Does not cause flickering because elements are inserted or deleted directly.
• Can affect the layout flow of DOM nodes because deleted elements will not occupy space.

Disadvantages:

• The performance overhead is higher because elements need to be destroyed and recreated.
• Not suitable for frequently switching display/hide elements.

Summary

• If you need to frequently switch between showing/hiding elements and performance is key, use v-show.
• If you need to affect the layout flow of DOM nodes or avoid flickering, use v-if.

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