如题.
2.代码.
<script type="text/javascript">
var name="jjjjjj哈哈jjjjjjjjjjjjjddddddddddddddddddddkkkkkkkkkkkkkkkkkk";
name=name.replace(/([^\n]{20})/g,"$1\n");
alert(name);
</script>
3.注意. ^\n代表你要插入的字符,这个是"不包含换行符"的意思 . 原文链接：https://www.f2er.com/regex/360987.html