QQ聊天消息显示，提交评论等实现原理，具体内容如下
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
.bos {
margin: 100px auto;
width: 350px;
position: relative;
}
.bos a {
float: right;
}
button {
position: relative;
left: 301px;
bottom: 0;
}
textarea {
width: 350px;
resize: none;
}
ul li {
list-style: none;
}
</style>
<script type="text/javascript">
window.onload = function() {
var txt = document.getElementById('txt');
var btn = document.getElementsByTagName('button')[0];
var oUl = document.getElementsByTagName('ul')[0];
btn.onclick = function() {
if(txt.value == '') {
alert('请输入...');
return false; //结束事件*******
}
var newli = document.createElement('li'); //创建标签<li></li>
newli.innerHTML = txt.value + '<a href = "#">删除<a>';
//oUl.appendChild(newli); //将创建标签<li></li>加到最后面
var lis = oUl.childNodes; //oUl.children
oUl.insertBefore(newli, lis[0]); //将创建标签<li></li>加到最前面
txt.value = '';
//删除发出去的消息
var oA = document.getElementsByTagName('a');
for(var i = 0; i < oA.length; i++) {
oA[i].onclick = function() {
oUl.removeChild(this.parentNode);
}
}
}
}
</script>
</head>
<body>
<div id="box" class="bos">
<textarea name="" id="txt" cols="30" rows="10"></textarea>
<button>submit</button>
<ul></ul>
</div>
</body>
</html>
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