current position:Home>One who writes an article must master Vue immediately. (6) filters
One who writes an article must master Vue immediately. (6) filters
2022-01-29 15:24:01 【Silver rain starry sky】
The data we render to the page is usually from the database , The data stored in the database is often difficult for us to predict , In order to avoid data formats beyond our expectations , We need to filter .
- tip:2020 year 9 month ,
vue3
Come out . Added a lot of new features , But some of the features have also been deleted . Like deletingvue2
Filter infilter
function . meanwhile , The official advice :Replace the filter with a method call or calculated property .
filters filter
Filter use
filter
seeing the name of a thing one thinks of its function , Filter out unwanted data , Not without data , It's dealing with , Usually cut .
The basic format : {{ Variable | Functions that handle variables , This function comes from filters object }}
<div id="app" v-cloak>
<div>{{num|showNum}}</div>
</div>
Copy code
......
data:{
num:123.231
},
filters:{
showNum(num){
return num.toFixed(1)
}
}
......
Copy code
——v- Use filters in instructions
We are apart from Interpolation expression
Use a filter in the , We can still do that v- Instructions
Use a filter in the .
<input type="text" :value="num|showNum" id="">
{{num}}
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Note that if in use v- Use filters on directives or attributes .
Multivalued filter
adopt |
The previous variable is used as the parameter of the filter , I can also add more parameters . Through the following format :
<div>{{string|showString(' Start with a capital :')}}</div>
Copy code
In the case of multiple values , The default acceptance parameter is |
Variables before , And by ()
The passed in argument is assigned to the subsequent parameter , And you can pass in multiple parameters for function design .
......
filters:{
......
showString(str1,str2){
//str1 Namely string
return str2 + str1.replace(/^[^]/,($)=>$.toUpperCase())
}
}
......
Copy code
Nested filter
If v-for
equally , We use filter
You can also nest , Because I can put the original Interpolation expression
As a whole variable .
<div>{{speed|moreSpeed|moreSpeed}}</div>
{{speed}}
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......
moreSpeed(speed){
return speed*2
}
......
Copy code
As said at the beginning, our filter itself is no longer vue3 Reserved , So I suggest you just study for the purpose of learning , Reduce use in projects , For the future
vue2
turnvue3
Smooth and preventive Injection .
copyright notice
author[Silver rain starry sky],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2022/01/202201291523590126.html
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