docs: public static int colNameToIndex(String colName) {
  		int length = colName.length();
  		char c;
  		int index = -1;
  		for (int i = 0; i < length; i++) {
  			c = Character.toUpperCase(colName.charAt(i));
  			if (Character.isDigit(c)) {
  				break;// 确定指定的char值是否为数字
  			}
  			index = (index + 1) * 26 + (int) c - 'A';
  		}
  		return index;
  	}