📅  最后修改于: 2022-03-11 15:01:12.609000             🧑  作者: Mango
//simple counter in javascript
// this is button element variable
const button = document.querySelectorAll(".btn")
//this variable for display counter number
const h3 = document.querySelector(".counter")
//Count variable
let count = 0;
//foreach method
button.forEach((btn) => {
//event listener function
btn.addEventListener("click", (e) => {
//event targeting element
let target = e.currentTarget
//condition for counter variable
if (target.innerText == "reset") {
count = 0;
}
else if (target.innerText == "next") {
count++;
}
else if (target.innerText == "prev") {
count--;
}
//text contains according to the if condition
h3.innerHTML = count;
})
})