javascript正则表达式对字符串分组时产生空字符串组？

Question

javascript分割字符串，将汉字和非汉字分割出来，'张sdf四上法asdf翁芬aa33网s'.split(/([\u4e00-\u9fa5]{1})/gi);但返回的结果数组里却多出来几个空字符串：["","张","sdf","四","","上","","法","asdf","翁","","芬","aa33","网","s"]请问这个空字符串是怎么出来的？应该如何去除？首页感谢@KevinYue和@皓矾的回答，我的需求其实是把单个汉字分割出来，而且汉字和非汉字的分割要保证顺序，其实我也有其他的方法做，但我真正的问题是：原来的正则表达式为什么会多出几个空字符串？我一直没想明白，所以期望有人能解释一下。

Answer 1

这样也行吧？不过估计有更简化的写法。我忘了有没有直接前前一个匹配项取反了……
"张sdf四上法asdf翁芬aa33网s".match(/([\u4e00-\u9fa5]{1,})|([^\u4e00-\u9fa5]{1,})/gi);
//输出["张","sdf","四上法","asdf","翁芬","aa33","网","s"]
如果是要每个字符都分开是这样
"张sdf四上法asdf翁芬aa33网s".match(/([\u4e00-\u9fa5]{1})|([^\u4e00-\u9fa5]{1,})/gi);
//输出["张","sdf","四","上","法","asdf","翁","芬","aa33","网","s"]
至于为什么会出现多余的空字符串，其实是String.prototype.split使用正则表达式做为separator造成的，举个最简单的例子：
"abc".split(/([a-z])/gi);
//输出["","a","","b","","c",""]
时间不多，具体String.prototype.split的实现源码还没来得及看，但问题是出在它身上。