scipt.js

const inputBox = document.getElementById("input-box");
const listContainer = document.getElementById("List-container");
function addTask(){
 if(inputBox.value ==''){
    alert("You must write something!");
 }
 else{
    let li = document.createElement("li");
    li.innerHTML = inputBox.value;
    listContainer.appendChild(li);
    let span= document.createElement("span");
    span.innerHTML= "\u00d7";
    li.appendChild(span);
 }
 inputBox.value="";
 saveData();
}
listContainer.addEventListener("click", function(e){
    if(e.target.tagName === "LI"){
        e.target.classList.toggle("checked");
    }
    else if(e.target.tagName === "SPAN"){
        e.target.parentElement.remove();
        saveData();
    }
}, false);
function saveData(){
    localStorage.setItem("todo-data",listContainer.innerHTML);
}
function showlist(){
    listContainer.innerHTML= localStorage.getItem("todo-data");
}
showlist();