样例:
CSS代码:
* {
margin: 0;
padding: 0;
}
ul{
list-style: none;
}
.w {
width: 900px;
margin: 0 auto;
}
.controls textarea {
width: 878px;
height: 100px;
resize: none;
border-radius: 10px;
outline: none;
padding-left: 20px;
padding-top: 10px;
font-size: 18px;
}
.controls {
overflow: hidden;
}
.controls div {
float: right;
}
.controls div span {
color: #666;
}
.controls div .useCount {
color: red;
}
.controls div button {
width: 100px;
outline: none;
border: none;
background: rgb(0, 132, 255);
height: 30px;
cursor: pointer;
color: #fff;
font: bold 14px '宋体';
transition: all 0.5s;
}
.controls div button:hover {
background: rgb(0, 225, 255);
}
.controls div button:disabled {
background: rgba(0, 225, 255, 0.5);
}
.contentList {
margin-top: 50px;
}
.contentList ul {
height: 800px;
}
.contentList li {
/* display: none; */
padding: 20px 0;
border-bottom: 1px dashed #ccc;
height: 60px;
}
.contentList li a {
margin-left: 800px;
} HTML代码:
<!DOCTYPE html>
<html lang="en">
<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>Document</title>
<link rel="stylesheet" href="./css/weibo.css">
<script src="../发布微博案例/jquery-3.7.1.min.js"></script>
</head>
<body>
<div class="w">
<div class="controls">
<img src="images/tip.png" alt=""><br>
<textarea placeholder="说点什么吧..." id="area" cols="30" rows="10" maxlength="200"></textarea>
<div>
<span class="useCount">0</span>
<span>/</span>
<span>200</span>
<button id="send">发布</button>
</div>
</div>
<div class="contentList">
<ul id="list">
</ul>
</div>
</div>
<script src="./index.js"></script>
</body>
</html> js代码:
const user=[{usname:'未命名',imgSrc:'images/03.jpg'}]
let textarea=document.querySelector('textarea')
let useCount=document.querySelector('.useCount')
let btn=document.querySelector('#send')
let ul=document.querySelector('#list')
//检测输入字数:
textarea.addEventListener('input',function(){
useCount.innerHTML=this.value.length
})
btn.addEventListener('click',function(){
//输入不能为空
if(textarea.value.trim()==='')
{
return alert('内容不能为空')
}
function getrandom(min,max){
return Math.floor(Math.random()*(max-min+1))+min
}
let a=getrandom(0,user.length-1)
// 新增留言 应写在点击事件内部
// 创建一个小li 然后里面通过innerHTML追加数据
let li=document.createElement('li')
li.innerHTML=`<div class="info">
<img src=${user[a].imgSrc}>
<span class="username">${user[a].usname}</span>
<button class="del">删除</button>
<div class="content">${textarea.value}</div>
<div class="send-time">${new Date().toLocaleString()}</div>`
//删除
let del = li.querySelector('.del');
del.addEventListener('click', function () {
ul.removeChild(li);
});
//
ul.insertBefore(li, ul.children[0]);
textarea.value = '';
useCount.innerHTML = 0;
})
//再按下回车同时发送
textarea.addEventListener('keyup',function(a){
if(a.key === 'Enter'){
btn.click()
}
})
