从 JavaScript 字符串中删除零宽度空格字符
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Remove zero-width space characters from a JavaScript string
提问by user1437328
I take user-input (JS code) and execute (process) them in realtime to show some output.
我获取用户输入（JS 代码）并实时执行（处理）它们以显示一些输出。
Sometimes the code has those zero width space, it's really weird. i don't know how the users are input'ing that. Example - "(?$".length === 3
有时代码有那些零宽度空间，这真的很奇怪。我不知道用户是如何输入的。例子 - ”(?$".length === 3
I need to be able to remove that character from my code in JS. How do I do so ? or maybe theres some other way to execute that JS code so that the browser doesn't takes the zero width space characters into account ?
我需要能够从我的 JS 代码中删除该字符。我该怎么做？或者也许有其他方法来执行该 JS 代码，以便浏览器不考虑零宽度空格字符？
回答by Mathias Bynens
Unicode has the following zero-width characters:
Unicode 具有以下零宽度字符：
- U+200B zero width space
- U+200C zero width non-joiner Unicode code point
- U+200D zero width joiner Unicode code point
- U+FEFF zero width no-break space Unicode code point
- U+200B 零宽度空间
- U+200C 零宽度非连接器 Unicode 代码点
- U+200D 零宽度连接器 Unicode 代码点
- U+FEFF 零宽度不间断空格 Unicode 代码点
To remove them from a string in JavaScript, you can use a simple regular expression:
要从 JavaScript 中的字符串中删除它们，您可以使用一个简单的正则表达式：
var userInput = 'a\u200Bb\u200Cc\u200Dd\uFEFFe';
console.log(userInput.length); // 9
var result = userInput.replace(/[\u200B-\u200D\uFEFF]/g, '');
console.log(result.length); // 5
Note that there are many more symbols that may not be visible. Some of ASCII's control characters, for example.
请注意，还有更多可能不可见的符号。例如，一些ASCII 的控制字符。
回答by Technotronic
I had a problem some invisible characters were corrupting my JSON and causing Unexpected Token ILLEGALexception which was crashing my site.
我遇到了一些不可见字符破坏了我的 JSON 并导致意外令牌非法异常的问题，这使我的网站崩溃。
Here is my solution using RegExp variable:
这是我使用 RegExp 变量的解决方案：
var re = new RegExp("\u2028|\u2029");
var result = text.replace(re, '');
More about Javascript and zero width spaces you can find here: Zero Width Spaces
您可以在此处找到有关 Javascript 和零宽度空间的更多信息： Zero Width Spaces
回答by Tarek Salah uddin Mahmud
str.replace(/\u200B/g,'');
200B is the hexadecimal of the zero width space 8203. replace this with empty string to remove this
200B 是零宽度空格 8203 的十六进制。用空字符串替换它以去除它
回答by Florian Margaine
[].filter.call( str, function( c ) {
return c.charCodeAt( 0 ) !== 8203;
} );
Filter each character to remove the 8203 char code (zero-width space unicode number).
过滤每个字符以删除 8203 字符代码（零宽度空间 unicode 数字）。
