JSFiddle - React, Tailwind, and code Playground

by skirtle

HTML

<script src="https://unpkg.com/[email protected]/dist/vue.global.js"></script>
<div id="app">
  <input  v-model="form.a" />
  <input  v-model="form.b" />
  <button :class="{disabled: btnDisabled}">Enviar</button>
</div>

CSS

.disabled {
  color: red;
}

JavaScript

Vue.createApp({
  data () {
    return {
      form: {
        a: '',
        b: ''
      }
    }
  },
  
  computed: {
    btnDisabled () {
      return +this.form.a > +this.form.b
    }
  }
}).mount('#app')