div contenteditable 的光标定位(仿input的maxlength)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
div{
border: 1px solid;
height: 500px;
padding: 20px;
}
</style>
</head>
<body>
<div id="div" contenteditable="true"></div>
</body>
</html>
<script>
document.getElementById('div').focus()
document.getElementById('div').addEventListener('keydown', (e) => {
var ev = e || window.event
if (ev.target.innerText.length > 20 && ev.keyCode !== 8 && ev.keyCode !== 116) {
ev.preventDefault()
}
})
document.getElementById('div').addEventListener('input', (e) => {
let ev = e || window.event
if (ev.target.innerText.length > 20) {