javascript 删除空格后的所有字符串
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Remove all string after a space
提问by Gonzalo Rivera
I have this variable
我有这个变量
c#
C＃
string text = "val1 val2";
javastript
条码
var text = "val1 val2"
I need a example to remove everything after the space so that the result is
string textModified = "val1";
我需要一个例子来删除空格后的所有内容，以便结果是
string textModified = "val1";
Can u help me?
你能帮我吗？
回答by Amit Joki
In both the cases, just split on " "and take the element on index 0. The below is for javascript
在这两种情况下，只需拆分" "并获取 index上的元素0。以下是针对javascript 的
alert(text.split(" ")[0]); // Javascript
And this is for c#
这是用于c#
Console.WriteLine(text.Split(' ')[0]);
回答by Wilfredo P
One example would be:
一个例子是：
c#
C＃
string text = "val1 val2";
string textModified = text.Split(' ')[0];
//Another way:
string textModified = text.IndexOf(' ');
var textModified = text.Substring(0, index);
Js
JS
var text = "val1 val2";
var textModified = text.Split(' ')[0];
// Another way:
var index = text.indexOf(' ');
var textModified = text.substring(0, index);
回答by fubo
here another approach with SubString
这里是 SubString 的另一种方法
string text = "val1 val2";
int Space = text.IndexOf(' ');
string textModified = text.Substring(0, Space > 0 ? Space : text.Length);
and Linq
和林克
string text = "val1 val2";
string textModified = new string(text.TakeWhile(x => x != ' ').ToArray());
回答by Alex K.
Rather than splitting:
而不是分裂：
var word = text.substr(0, (text + " ").indexOf(" "));
(Swap to .Substring/ .IndexOfin C#)
（在 C# 中切换到.Substring/ .IndexOf）
For fun, C# and JS (ES5) both:
为了好玩，C# 和 JS (ES5) 都：
var output = ""; var i = 0;
text += " ";
while (text[i] != ' ')
output += text[i++];
回答by Habib
You can use String.Removeto remove everything after space. Use String.IndexOfto find space in the string.
您可以使用String.Remove删除空格后的所有内容。使用String.IndexOf查找字符串中的空间。
string text = "val1 val2";
string newText = text.Remove(text.IndexOf(' '));
You can also check if the string contains a space or not like:
您还可以检查字符串是否包含空格，例如：
if (text.Contains(' '))
{
string newText = text.Remove(text.IndexOf(' '));
}
This will save you from the exception in case of absence of space in the string.
如果字符串中没有空格，这将使您免于出现异常。
As for JavaScript: you can do:
至于 JavaScript：你可以这样做：
console.log(text.substr(0,text.indexOf(' ')));
Should add checking for presence of space as well.
还应该添加检查空间是否存在。
回答by B Carey
I don't like to through away data you may need in the future so how about just breaking up the string into components. Since you know a space is a separator just set space " " as the delimiter for breaking up the line. The following is an example:
我不喜欢删除您将来可能需要的数据，所以将字符串分解为组件如何。由于您知道空格是分隔符，因此只需将空格“”设置为分隔行的分隔符。下面是一个例子：
string[] read_Items = new string[15];
string text = "val1 val2"
int item_cnt = 0;
// set delimiter for a single space
char[] delimiters = new char[] { ' ' };
// Remove and double spaces and replace them with single spaces
while (test.Contains(" "))
test = test.Replace(" ", " ");
// Break up line into individual items
foreach (string word in test.Split(delimiters))
{
read_Items[item_cnt] = word;
item_cnt++;
if (item_cnt > 14)
break;
}
Now you have an array of items you can size this to fit any number of items in a line. Note: If you needed to have more then one delimiter say you also needed to split on '=', ':'your delimiter definition would be:
现在您有一个项目数组，您可以调整它的大小以适合一行中的任意数量的项目。注意：如果您需要多于一个分隔符，那么您还需要在 '=', ':' 上拆分，您的分隔符定义将是：
char[] delimiters = new char[] { ' ', '=', ':' };
