为什么无法通过 DOM 将任务归类到已完成状态？

// 事件代理 - 监听 input 派发 change 事件
contentDom.addEventListener("change", (event) => {
  let target = event.target;
  if (
    target.dataset.form === "todo" &&
    target.tagName === "INPUT"
  ) {
    let index = +target.dataset.index;
    // 删除这一项
    let value = data.todoArr.splice(index, 1)[0];
    // 添加到 done
    data.doneArr.push(value);
    render(data);
  } else if (
    target.dataset.form === "done" &&
    target.tagName === "INPUT"
  ) {
    let index = +target.dataset.index;
    let value = data.doneArr.splice(index, 1)[0];
    data.todoArr.push(value);
    render(data);
  }
});

// 事件代理 - 监听 tag 派发 click 事件
contentDom.addEventListener("click", (event) => {
  let target = event.target;
  if (
    target.dataset.form === "todo" &&
    target.tagName === "IMG"
  ) {
    let index = +target.dataset.index;
    data.todoArr.splice(index, 1);
    render(data);
  } else if (
    target.dataset.form === "done" &&
    target.tagName === "IMG"
  ) {
    let index = +target.dataset.index;
    data.doneArr.splice(index, 1);
    render(data);
  }
});