Vue advanced (per unit): Vue computes attributes and transfers parameters within the computed method

No Silver Bullet 2020-11-13 07:28:48
vue advanced unit vue computes


In the early post 《Vue Advanced ( eighty four ):vue in Computed and Watch The use and difference of 》 in , Explained vue in Computed and Watch The use and difference of , among , It's just an introduction computed How to calculate element properties , It is not introduced how to transfer the reference . Porcelain blog mainly explains how to use computed The calculated properties of the .

Scene Introduction

In the process of front-end project development , Code value conversion scenarios will be encountered , And different pages will have multiplex code value conversion , In order to improve the code usage rate , Consider extracting code value conversion functions into common functions , After the common function returns the transcoded text , How to display reasonably in the page ? Tried a method call , But unfortunately, the transcoding text is not displayed on the page , Consider using computed Compute properties , Apply... To the result list computed Compute properties , Code value of input list data is required ,
vue in computed Computed properties cannot be passed directly

If you need to pass parameters, such as data filtering, you can use the closure function ( Also called anonymous function ) Realization

for example :

In the last blog vue Install and use the filter function in the last grade table exercise :

 Copy code
<tr v-for="(item,index) in arr" v-if="myfilter(index)">
<td>{
{item.username}}</td>
<td>{
{item.sex}}</td>
<td>{
{item.grade}}</td>
<td>
<a href="#" @click="delClick(index)"> Delete </a>
</td>
</tr>
computed Compute properties :
export default {
name: 'Achievement',
data () {
return {
...
}
},
methods: {
...
},
computed: {
myfilter() {
return function(index){
return this.arr[index].username.match(this.name)!==null;
}
}
}
}
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