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老师批语：
下面将展示在线客服代码及效果图
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>客服自动回复</title>
<style type="text/css">
div:nth-child(1) {
width: 450px;
height: 650px;
background-color: lightskyblue;
margin: 30px auto;
color: #333;
box-shadow: 2px 2px 2px #808080
}
h2 {
text-align: center;
margin-bottom: -10px;
}
div:nth-child(2) {
width: 400px;
height: 500px;
border: 4px double green;
background-color: #efefef;
margin: 20px auto 10px;
}
ul {
list-style: none;
line-height: 2em;
/*border: 1px solid red;*/
overflow: hidden;
padding: 15px;
}
table {
width: 90%;
height:80px;
margin: auto;
}
textarea{
/*width: 300px;*/
border: none;
resize: none;
background-color: lightyellow;
}
button {
width: 60px;
height: 40px;
background-color: seagreen;
color: white;
border: none;
/*text-align: left;*/
}
button:hover {
cursor: pointer;
background-color: orange;
}
</style>
</head>
<body>
<div>
<h2>在线客服</h2>
<div contenteditable="true">
<ul>
<li></li>
</ul>
</div>
<table>
<tr>
<td align="right"><textarea cols="50" rows="4" name="text" autofocus></textarea></td>
<td align="left"><button type=button>发送</button></td>
</tr>
</table>
</div>
<script type="text/javascript">
var btn = document.getElementsByTagName('button')[0];
var text=document.getElementsByName('text')[0];
var list=document.getElementsByTagName('ul')[0];
var sum=0;
btn.onclick=function () {
var li=document.createElement('li');
li.innerHTML=text.value;
text.value='';
list.appendChild(li);
sum+=1;
//自动回复
//定时
setTimeout(function () {
var info = ['你好', '在的', '嗯，稍等'];
var temp = info[Math.floor(Math.random() * 3)];
var li1 = document.createElement('li');
li1.innerHTML = temp;
list.appendChild(li1);
sum+=1;
},2000);
if(sum>10){
list.innerHTML='';
sum=0;
}
}
</script>
</body>
</html>点击 "运行实例" 按钮查看在线实例
2.本次学到了在线客服的基本流程
知识点：setTimeout（）定时器；
Math.floor(Math.random() * 3）随机数；
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