<ul class="fs-8" id="select-product-app">
<li class="chose-btns-contianer">25</li>
<li class="chose-btns-contianer">26</li>
<li class="chose-btns-contianer">27</li>
<li class="chose-btns-contianer">28</li>
<li class="chose-btns-contianer">29</li>
<li class="chose-btns-contianer">30</li>
</ul>as shown in the code, how to add a btn-active class for li after vue is clicked, and click something else to switch back and forth?
vue is implemented with: class='' method. Vue needs to be bound to a unique judgment condition for each li.
for example: classShow is ture or false
<li v-for='(item,index) in lists' class="chose-btns-contianer" :class='{"btn-active":item.classShow}' @click='run(index)'>25</li>
run(index){
this.lists.forEach(v=>{
v.classShow=false;//libtn-active
})
this.lists[index].classShow=true;
}
to make such class switching, vue is more troublesome than jq;
use a flag to mark which element is currently clicked, and when flag is consistent with the current element, add btn-active
<ul class="fs-8" id="select-product-app">
<li class="chose-btns-contianer" @click="flag=25"
:class="{'btn-active': flag===25}">25</li>
<li class="chose-btns-contianer" @click="flag=26"
:class="{'btn-active': flag===26}">26</li>
<li class="chose-btns-contianer" @click="flag=27"
:class="{'btn-active': flag===25}">27</li>
<li class="chose-btns-contianer" @click="flag=28"
:class="{'btn-active': flag===28}">28</li>
</ul>1. Define the class name you want to add in data
2. 
index
3.
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