不输入表单时如何解决禁用按钮问题

Question

我想在不输入表单时设置一个禁用的按钮

computed: {
    permit () {
      return this.$store.getters.permit
    },
    formIsValid () {
      return this.legal_name !== "" && this.name !== "" && this.address !== "" && this.city !== "" && this.email !== "" && this.phone !== "" && this.website !== "" && this.admin_email !== "" && this.admin_password !== ""
    }
  },