this is true by default when you click all,
<div id="dialog">
<div class="dialog_select">
<p class="dialog_please">
<p class="dialog_button">
<button class="dialog_all dialog_red" @click="allData"></button>
<button class="dialog_all" @click="payData"></button>
<button class="dialog_all" @click="payData"></button>
</div>
</div> <button :class="['dialog_all',{dialog_red:active_btn==1}]" @click="allData"></button>
<button :class="['dialog_all',{dialog_red:active_btn==2}]" @click="payData"></button>
<button :class="['dialog_all',{dialog_red:active_btn==3}]" @click="payData"></button>
data:
{
active_btn:1
}change active_btn when you click the button
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