readAll()函数源码

不同的编程语言可能有不同的readAll()函数实现方式，以下是一些常见编程语言的readAll()函数源码实例：

Python:

def readAll(file_path):
    with open(file_path, 'r') as f:
        return f.read()

Java:

public static String readAll(String filePath) throws IOException {
    BufferedReader reader = new BufferedReader(new FileReader(filePath));
    StringBuilder stringBuilder = new StringBuilder();
    String line;
    while ((line = reader.readLine()) != null) {
        stringBuilder.append(line);
    }
    reader.close();
    return stringBuilder.toString();
}

C++:

#include <fstream>
#include <string>

std::string readAll(const std::string& file_path) {
  std::ifstream file(file_path);
  std::string content((std::istreambuf_iterator<char>(file)),
                      (std::istreambuf_iterator<char>()));
  return content;
}

JavaScript/Node.js:

const fs = require('fs');

function readAll(filePath) {
    return fs.readFileSync(filePath, 'utf8');
}

以上代码仅供参考，具体实现方式可能因不同需求或环境而异。