<div id="app">
<button :class="['btn', isError ? 'btn-danger' : 'btn-success']" @click="isError = !isError">Submit</button>
</div>var vue = new Vue({
el: "#app",
data: {
isError: false
}
});
<div id="app">
<button :class="['btn', isError ? 'btn-danger' : 'btn-success']" @click="isError = !isError">Submit</button>
</div>var vue = new Vue({
el: "#app",
data: {
isError: false
}
});