function.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");
        savedata();
    }
    else if(e.target.tagName === "SPAN"){
        e.target.parentElement.remove();
        savedata();
    }
}, false);
function savedata(){
    localStorage.setItem("data", listcontainer.innerHTML);
}
function showtask()
{
    listcontainer.innerHTML=localStorage.getItem("data");

}
showtask();