在特定子字符串之前提取2个子字符串

function extractTwoSubstringsBeforeSpecificSubstring(originalString, specificSubstring) {
  // 找到特定子字符串的位置
  var specificSubstringIndex = originalString.indexOf(specificSubstring);
  
  // 提取特定子字符串之前的部分字符串
  var substring1 = originalString.substring(0, specificSubstringIndex);
  
  // 提取特定子字符串之后的部分字符串
  var substring2 = originalString.substring(specificSubstringIndex + specificSubstring.length);
  
  // 返回提取的两个子字符串
  return [substring1, substring2];
}

// 示例用法
var originalString = "在特定子字符串之前提取2个子字符串的示例";
var specificSubstring = "之前";
var result = extractTwoSubstringsBeforeSpecificSubstring(originalString, specificSubstring);
console.log(result[0]);  // 输出："在特定子字符串"
console.log(result[1]);  // 输出："提取2个子字符串的示例"