<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>模拟实时聊天</title>
<style>
div:nth-child(1){
width: 450px;height: 650px;background:#1891ed;margin:30px auto;color: #333;box-shadow: 2px 2px 2px #808080;
}
h2{text-align: center;padding-top: 20px;}
div:nth-child(2){
width: 400px;height: 500px;
margin:20px auto 10px;
background:#fff;
}
ul{list-style: none;line-height: 2em;overflow: hidden;padding: 15px}
table{height:60px;margin:auto; padding:0 20px}
textarea{width: 95%;border:none;resize: none;background: #fffdde;height: 40px;}
button{width: 60px;height: 40px;background: #0089ff;color: #fff;border:none;box-shadow: 0px 0px 10px #ccc}
button:hover{cursor: pointer;background: #ff6700}
</style>
</head>
<body>
<div>
<h2>实时聊天</h2>
<div>
<ul>
<li></li>
</ul>
</div>
<table>
<tr>
<td aling='right'><textarea name="text" id="" cols="50" rows="4"></textarea> </td>
<td><button type="button">发送</button></td>
</tr>
</table>
</div>
<script>
let btn = document.getElementsByTagName('button')[0];
let text = document.getElementsByName('text')[0];
let list =document.getElementsByTagName('ul')[0];
let sum = 0;
btn.onclick = function(){
if (text.value.length === 0){
alert('请输入');
return false;
}
let userComment =text.value;
text.value='';
let li = document.createElement('li');
li.innerHTML =userComment;
let userPic='<img src="" width="30" style="border-radius:50%"/>';
li.innerHTML=userPic+''+userComment;
list.appendChild(li);
sum +=1;
console.log(sum);
setTimeout(function(){
let info =[
'html',
'css',
'javascript',
'jQuery',
'leyui',
'dom操作',
'学无止境',
];
let temp = info[Math.floor(Math.random()*7)];
let reply = document.createElement('li');
let kefupic ='<img src="" width="30" style="border-radius:50%" />';
reply.innerHTML= kefupic+''+'<span style="color:red">'+temp+'</span>';
list.appendChild(reply);
sum +=1;
console.log(sum);
},4000);
if(sum>10){
list.innerHTML='';
sum = 0;
}
}
</script>
</body>
</html>
