删除一行中逗号之前的所有内容

要删除一行中逗号之前的所有内容，可以使用多种编程语言中的字符串处理功能。以下是几种不同编程语言的示例代码：

Python 示例

def remove_before_comma(line):
    comma_index = line.find(',')
    if comma_index != -1:
        return line[comma_index + 1:].strip()
    return line.strip()

# 示例使用
line = "Hello, World!"
result = remove_before_comma(line)
print(result)  # 输出: World!

JavaScript 示例

function removeBeforeComma(line) {
    const commaIndex = line.indexOf(',');
    if (commaIndex !== -1) {
        return line.substring(commaIndex + 1).trim();
    }
    return line.trim();
}

// 示例使用
const line = "Hello, World!";
const result = removeBeforeComma(line);
console.log(result);  // 输出: World!

Java 示例

public class Main {
    public static String removeBeforeComma(String line) {
        int commaIndex = line.indexOf(',');
        if (commaIndex != -1) {
            return line.substring(commaIndex + 1).trim();
        }
        return line.trim();
    }

    public static void main(String[] args) {
        String line = "Hello, World!";
        String result = removeBeforeComma(line);
        System.out.println(result);  // 输出: World!
    }
}

C# 示例

using System;

public class Program
{
    public static string RemoveBeforeComma(string line)
    {
        int commaIndex = line.IndexOf(',');
        if (commaIndex != -1)
        {
            return line.Substring(commaIndex + 1).Trim();
        }
        return line.Trim();
    }

    public static void Main()
    {
        string line = "Hello, World!";
        string result = RemoveBeforeComma(line);
        Console.WriteLine(result);  // 输出: World!
    }
}