JSFiddle - React, Tailwind, and code Playground
JavaScript
//현재요일의 index값구하기
var weekday = new Array(6);
weekday[1]=1;
weekday[2]=2;
weekday[3]=3;
weekday[4]=4;
weekday[5]=5;
weekday[6]=6;
var weekIndex = weekday[new Date().getDay()];
alert(weekIndex);