JS Regular expression extracts all Chinese characters in the string script _ regular expression

On the internet to find someone with VBScript regular expression to achieve this function, but the code is very factory, I changed to JS, a very short piece of code:

How do <script type= "Text/javascript" > var str= extract all Chinese characters from an HTML page? Cannot have other HTML code. "; Alert (Str.replace (/[^\u4e00-\u9fa5]/gi, "")); </script>
[Ctrl + A All SELECT Note: If the need to introduce external JS need to refresh to perform]

The key here is the Chinese character escape after the coding range is \U4E00-\U9FA5, know this problem can be solved.