将一维数组中的字符串转换为二维数组，每个字符作为单独的元素

function convertTo2DArray(strArray, numRows, numCols) {
  let twoDArray = new Array(numRows);
  
  for (let i = 0; i < numRows; i++) {
    twoDArray[i] = new Array(numCols);
    
    for (let j = 0; j < numCols; j++) {
      let index = i * numCols + j;
      if (index < strArray.length) {
        twoDArray[i][j] = strArray[index];
      } else {
        twoDArray[i][j] = "";
      }
    }
  }
  
  return twoDArray;
}

// 示例用法
let strArray = ["a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l"];
let numRows = 3;
let numCols = 4;

let result = convertTo2DArray(strArray, numRows, numCols);
console.log(result);