classcard.js

isStop = false

let words = document.querySelectorAll(".match-body.left .flip-card")
let meanings = document.querySelectorAll(".match-body.right .flip-card")

function clickAnswers() {

    for(let i = 0; i < 4; i += 1) {
        for(let j = 0; j < 4; j += 1) {
            if (words[i].getAttribute("data-idx") === meanings[j].getAttribute("data-idx")) {
                words[i].click()
                meanings[j].click()
                return
            }
        }
    }

    console.log("------ NO ANSWER!! ------")
    
}

let i = setInterval(function() {
    clickAnswers()
    if (isStop) {
        clearInterval(i)
    }
}, 1250)