<template>
    <div>
        <input type="text" v-model="form1">
        <input type="text" v-model="form2">
        <button :disabled="isDisabled"> Button</button>
    </div>
</template>

<script>
export default {
    data() {
        return{
            form1: '',
            form2: ''
        }
    },
    computed: {
        isDisabled(){
            return form1 === '' || form2 === ''
        }
    },
}
</script>