abstrak：<!DOCTYPE html><html><head><meta charset="UTF-8"><title>Document</title></head><body><input type="button" name="" value
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="button" name="" value="刪除冬" onclick="shan();">
<input type="button" name="" value="刪最后" onclick="last();">
<input type="button" name="" value="添加" onclick="jia();">
<ul>
<li>春</li>
<li>夏</li>
<li>秋</li>
<li>冬</li>
</ul>
</body>
</html>
<script type="text/javascript">
function shan(){
/*var dong = document.getElementsByTagName('li')[3];
var ul = dong.parentNode;
ul.removeChild(dong);*/
var ul = document.getElementsByTagName('ul')[0];
var li = ul.children[3];
ul.removeChild(li);
}
function last(){
var ul = document.getElementsByTagName('ul')[0];
var li = ul.children[ul.children.length-1];
ul.removeChild(li);
}
function jia(){
var li = document.createElement('li');
var dong = document.createTextNode('冬');
li.appendChild(dong);
var ul = document.getElementsByTagName('ul')[0];
ul.appendChild(li);
}
</script>
Guru membetulkan：滅絕師太Masa pembetulan：2019-03-05 09:12:52
Rumusan guru：作業(yè)內容和題目對不上號哦!請認真完成當前作業(yè)