console
<!DOCTYPE html>
<html>
<head>
<title>添加和删除li</title>
</head>
<body>
<ul id="myList">
<li>Item 1 <button onclick="deleteItem(this)">删除</button></li>
<li>Item 2 <button onclick="deleteItem(this)">删除</button></li>
<li>Item 3 <button onclick="deleteItem(this)">删除</button></li>
</ul>
<button onclick="addItem()">添加新项</button>
<script>
function deleteItem(button) {
var listItem = button.parentNode;
var myList = document.getElementById("myList");
myList.removeChild(listItem);
}
function addItem() {
var newItem = document.createElement("li");
newItem.textContent = "New Item " + (document.querySelectorAll("li").length + 1);
var deleteButton = document.createElement("button");
deleteButton.textContent = "删除";
deleteButton.onclick = function() {
deleteItem(this);
};
newItem.appendChild(deleteButton);
var myList = document.getElementById("myList");
myList.appendChild(newItem);
}
</script>
</body>
</html>