如何删除每个字母 退格键按钮上每个 keydown 处的段落元素的文本内容，如输入字段一次删除一个字母。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>repl.it</title>
<link href="style.css" rel="stylesheet" type="text/css" />
</head>
<body>
<p></p>
<script>
let p = document.querySelector("p")
document.addEventListener("keydown",function(e){
if(e.key === "Backspace"){
p.textContent-=e.key;
}else{
p.textContent+=e.key
}
})
</script>
</body>
</html>