Difference: 1. "v-if" dynamically adds or deletes DOM elements into the DOM tree, "v-show" controls the display and concealment by setting the display style attribute of the DOM element; 2. Compilation process Different; 3. The compilation conditions are different; 4. The switching cost of "v-if" is high, the initial rendering cost of "v-show" is high, etc.
The operating environment of this tutorial: windows7 system, vue2.9.6 version, DELL G3 computer.
The difference between v-if and v-show
v-if
command and v-show
command can both be used Dynamically control the display and hiding of DOM
elements based on the value. v-if
and v-show
are commonly used internal instructions of Vue
. The responsibility is to apply certain special behaviors to DOM
when the value of the expression changes.
Description
v-if
v-if
Command Used to conditionally render a piece of content. This piece of content will only be rendered when the expression of the directive returns the truthy
value.
<div>show</div> <div>hide</div>
v-show
v-show
The usage of the command is roughly the same, except that it contains v-show
The directive's element will always be rendered and remain in the DOM
, v-show
simply toggles the element's CSS property display
.
<div>show</div>
Difference
Implementation method:
v-if
is dynamic toDOM
Add or deleteDOM
elements in the tree,v-show
is controlled by setting thedisplay
style attribute of theDOM
element Reveal and conceal.Compilation process:
v-if
Switching has a process of partial compilation and uninstallation. During the switching process, the internal event listeners and sub-components are properly destroyed and rebuilt,v-show
is just a simple switch based onCSS
.Compilation conditions:
v-if
is lazy, if the initial condition is false, do nothing, only when the condition becomes true for the first time Only when partial compilation starts,v-show
is compiled under any conditions and then cached, and theDOM
elements are retained.Performance consumption:
v-if
has a higher switching cost,v-show
has a higher initial rendering cost.Usage scenarios:
v-if
is suitable for situations where conditions are unlikely to change,v-show
is suitable for situations where conditions are frequently switched.
Related recommendations: "vue.js Tutorial"
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