js設定ユーザーは必ず全文を読み終わってから同意協議を選ぶことができます.

that.$nextTick(() => {
    const el = document.querySelector('.reg-pro-wrap');
    const offsetHeight = el.offsetHeight;
    el.onscroll = () => {
        const scrollTop = el.scrollTop;
        const scrollHeight = el.scrollHeight;
        if ((offsetHeight + scrollTop) - scrollHeight >= -1) {
            //        
            console.log('      ')
            that.disabled = false;
        }
    };
});