????：<!DOCTYPE html> <html> <head> <meta charset="UTF-8">
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>聊天窗口信息發(fā)布，實現(xiàn)最新發(fā)布信息顯示在頂部</title>
</head>
<body>
<input type="text" name="content">
<button>提交</button>
<ul></ul>
<script>
var input = document.getElementsByName('content').item(0);
var btn = document.getElementsByTagName('button').item(0);
var ul = document.getElementsByTagName('ul').item(0);
//默認(rèn)進入input獲取焦點
input.focus();
//按鈕添加點擊事件
btn.onclick = function() {
var li = document.createElement('li');
li.innerHTML = input.value;
var len = ul.children.length;
//實現(xiàn)新發(fā)布的信息顯示在頂部
if (len === 0) {
ul.appendChild(li);
} else {
var first = ul.firstChild;
ul.insertBefore(li, first);
}
//提交完信息，情況輸入框和獲取焦點
input.value = '';
input.focus();
}
</script>
</body>
</html>
?? ???：滅絕師太?? ??：2019-03-02 14:57:27
???? ??：案例可以跳出老師上課代碼哦!希望有個人代碼風(fēng)格