Answers for "v on click class"

vue toggle class

<template>
  	<div>
      <div
        class="staticClass"
        v-bind:class="{ active: isActive, 'text-danger': hasError }"
      ></div>
      <!-- OR -->
      <div
           v-bind:class="[isActive ? activeClass : '', errorClass]"
      ></div>
	</div>
</template>

<script>
  export default {
  	data() {
      isActive: true,
      hasError: false,
      activeClass: 'active',
      errorClass: 'text-danger',
    }
  }
</script>

toggle on-click button vue

<button @click="variable = !variable">
	Toggle Value
</button>

<script>
export default {
  data () {
     return {
       variable: false
     }
  }
}
</script>