<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>自动滚动到底部</title>
<style>
* {
box-sizing: border-box;
}
body {
margin: 0;
height: 100vh;
display: flex;
flex-direction: column;
}
.chater {
flex: 1;
overflow: auto;
padding: 1em;
display: flex;
flex-direction: column-reverse;
}
.msger {
flex: 1;
display: flex;
flex-direction: column;
}
.msger > pre {
background-color: #eee;
padding: 1em;
border-radius: 8px;
white-space: pre-wrap;
}
.msger .user {
align-self: flex-end;
margin-left: 10vw;
}
.msger .ai {
align-self: flex-start;
margin-right: 10vw;
}
.sender {
flex-shrink: 0;
padding: 1em;
}
</style>
</head>
<body>
<div class="chater">
<div class="msger"></div>
</div>
<div class="sender">
<input type="text" />
<button onclick="send()">发送</button>
</div>
<script>
function send() {
document.querySelector('.chater').scrollTop = document.querySelector('.chater').scrollHeight
const pre = document.createElement('pre')
pre.className = 'user'
pre.textContent = document.querySelector('input').value
document.querySelector('.msger').appendChild(pre)
const pre2 = document.createElement('pre')
pre2.className = 'ai'
const timer = setInterval(() => {
pre2.textContent +=
String.fromCharCode(Math.floor(Math.random() * 122) + 65).repeat(
Math.ceil(Math.random() * 10)
) + (Math.random() < 0.2 ? '\n' : ' ')
if (pre2.textContent.length > 1000) clearInterval(timer)
}, 50)
document.querySelector('.msger').appendChild(pre2)
}
</script>
</body>
</html>