不好意思，我可以再次寻求帮助吗，但当检查其中一个列表，然后将其设置为完成= 1时，这仍然是一个错误。

但仍然重要的是，已检查的列表位于hps上（单击时我还添加了dg按钮，它将删除列表），然后完成td msh = 1，当删除时，列表将影响较早完成所以= 0

但是为什么不起作用，在btnDel函数部分

<div id="myDIV" class="header">
 <div class="input-group">
   <input type="text" class="form-control" placeholder="Your Text..."id="todo-input">
     <div class="input-group-append">
     <button class="btn btn-default input-group-text" id="todo-btn-add">Add</button>
    </div>
   </div>
  </div>
   <p class="text-danger d-none" id="alert">You must write something !</p>
 </div>
<p class="count-todo-completed">Completed : <span id="number">0</span></p>
<ul class="list-group" id="todo-list-items"></ul>

let renderItems = () => {
 DOMStrings.listItems.innerHTML = '';
  var ac;
    items.data.map((item,index) => {
      if (item.check) {
            ac = `
        <li class="list-group-item" index="${index}">
         <div class="form-check">
         <input type="checkbox" class="form-check-input" checked onchange="onChecked(this);">
         <label class="form-check-label"><strike>${item.name}</strike></label>
         </div>
         <span onclick="btnDel(this);">X</span>
        </li>
            `
        } else {
         ac = `
         <li class="list-group-item" index="${index}">
          <div class="form-check">
          <input type="checkbox" class="form-check-input" onchange="onChecked(this);">
          <label class="form-check-label">${item.name}</label>
          </div>
          <span onclick="btnDel(this);">X</span>
         </li>`
        }
        DOMStrings.listItems.innerHTML += ac;
    })
}

//count "completed"
let count = () => {
    var number = 0;
    for (index in items.data) {
     if (items.data[index].check) {
         number++;
      } 
    }
    items.completed = number;
    DOMStrings.countTodoCompleted.innerHTML = number;
}


// Create a "close" button and append it to each list item
let btnDel = (e) => {
    const index = e.parentElement.getattribute("index");

    if(btnDel.addEventListener("click",function(){
            number--
    }));

    DOMStrings.countTodoCompleted.innerHTML = number;

    e.parentElement.remove();
    items.data.splice(index,1);
    localStorage.setItem('items',JSON.stringify(items));
}