删除 Javascript 变量中的空格
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Remove spaces in a Javascript variable
提问by Naveen Gamage
I'm using AJAX to retrieve data from MYSQL database through PHP.
我正在使用 AJAX 通过 PHP 从 MYSQL 数据库中检索数据。
However, if there is no result found, the variable still has two spaces. I found the problem using alert(data.length);. The result is 2, which means there are two spaces.
但是，如果没有找到结果，变量仍然有两个空格。我发现问题使用alert(data.length);. 结果是2，这意味着有两个空格。
How can I remove these spaces so that if there is no result, I could display a message using if(data == ''){}?
如何删除这些空格，以便如果没有结果，我可以使用if(data == ''){}?
Thank you!
谢谢！
回答by VisioN
回答by Bruno
I can't understand why you have those two empty spaces in the first place. If it's a suitable option for you, I would try to remove those spaces at the origin, so from the server response.
我不明白为什么你首先有这两个空位。如果它对您来说是一个合适的选择，我会尝试从服务器响应中删除源处的那些空格。
If that's not possible you could use String.prototype.trimto remove leading/trailing white space. This would allow you to write your check as below
如果这是不可能的，您可以使用String.prototype.trim删除前导/尾随空格。这将允许你写你的支票如下
if (data.trim().length === 0) {
...
}
回答by lostsource
var str = "lots of whitespace";
str.replace(/\s+/g, ''); // 'lotsofwhitespace'
回答by David Müller
See this post where the topic is covered deeply, if you use jQuery, you can use $.trim()which is built-in.
回答by echo_Me
if your variable is datathen try this
如果你的变量是data然后试试这个
data.replace(/\s+/g, '');
and assign it to other variable if you want
并根据需要将其分配给其他变量
data2 = data.replace(/\s+/g, '');
回答by KingKongFrog
3 options:
3个选项：
var strg = "there is space";
strg.replace(/\s+/g, ' ');
or:
或者：
$.trim()
or:
或者：
String.prototype.trim = function() {
return this.replace(/^\s+|\s+$/g, "");
}
var strg = "there is space";
strg.trim();
回答by AJ Genung
data = data.split(' ').join('')that will remove all spaces from a string.
data = data.split(' ').join('')这将从字符串中删除所有空格。
