代码如下：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="https://vuejs.org/js/vue.min.js"></script>
</head>
<body>
<input type="text" onkeyup="this.value=this.value.replace(/[^0-9]+/g,‘‘)"> <!-- 禁止拼音混入 -->
<script>
document.querySelector("input").addEventListener("keydown", function(event){
if(event.key in [‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘0‘]){} // 允许数字
else if(event.keyCode == 8){} // 允许删除
else
event.preventDefault();
})
</script>
</body>
</html>
原文：https://www.cnblogs.com/catfish1921/p/15306158.html