code: function parseLine(line){
    var len = line.length;
    var i = 0;
    var lineArr = [];
    var preIndex = 0;
    var isEmpty = false;
    for(; i < len; i++){
      if(/\s/.test(line[i])){
        if(!isEmpty){
          lineArr.push(line.substr(preIndex, i - preIndex));
          isEmpty = true; 
        }
      }else{
        if(isEmpty){
          if(lineArr.length === FIXED_LEN){
            lineArr.push(line.substr(i));
            break;
          }else{
            isEmpty = false;
            preIndex = i;
          }
        }
      }
    }
    return lineArr;
  }
docs: const testStr = `文件系统       类型       1K-块      已用  Inode 已用(I) 挂载点 /dev/sda1      ext4     9156984   5494660 589824  284018 / common         vboxsf 248737076 156614724   1000       0 /mnt/common haha haha `