Javascript 正则保留字母

<script type="text/javascript"> 
var str="被窝放屁,能闻能捂1Id=?666。,吃《葡萄》不吐:&nbsp<#!#$%^&*()葡萄籽"; 
alert(str.replace(/[^a-zA-Z]/gi,"")); 
</script>
原文地址:https://www.cnblogs.com/zxy-room/p/11888187.html