代码优化：合并重复代码，提高效率

可以将相似的代码合并，重复利用。例如：

//定义一个方法，传入时间段和容器的下标，返回一个Container
Container getContainer(String time, int index, String msg) {
  return Container(
    child: TimelineTile(
      oppositeContents: Padding(
        padding: const EdgeInsets.all(8.0),
        child: Card(
          child: Container(
            width: widthx,
            padding: EdgeInsets.all(8.0),
            child: Text(
              time + '\n' +
                  eventcahe[index]['qssj']
                      .toString()
                      .split(' ')[0]
                      .substring(0, 5) +
                  ' - ' +
                  eventcahe[index]['jssj']
                      .toString()
                      .split(' ')[0]
                      .substring(0, 5),
              style: TextStyle(
                  color: Colors.black, fontWeight: FontWeight.bold),
            ),
          ),
        ),
      ),
      contents: GestureDetector(
        onTap: (() => Dialogs.bottomMaterialDialog(
              color: Colors.white,
              msg: msg,
              title: '详细信息',
              lottieBuilder: Lottie.asset(
                'assets/course.json',
                fit: BoxFit.contain,
              ),
              context: context,
            )),
        child: Card(
          color: Global.home_currentcolor,
          child: Container(
            width: widthx,
            padding: EdgeInsets.all(8.0),
            child: Text(
              eventcahe[index]['kcmc'] + '\n' + eventcahe[index]['jxcdmc'],
              style: TextStyle(color: Colors.white),
            ),
          ),
        ),
      ),
      node: TimelineNode(
        indicator: DotIndicator(
          color: Global.home_currentcolor,
        ),
        startConnector: SolidLineConnector(
          color: Global.home_currentcolor,
        ),
        endConnector: SolidLineConnector(
          color: Global.home_currentcolor,
        ),
      ),
    ),
  );
}

//调用方法
for (var i = 0; i < eventcahe.length; i++) {
  String msg = '课程名称:' +
      eventcahe[i]['kcmc'] +
      '\n' +
      '教室:' +
      eventcahe[i]['jxcdmc'] +
      '\n' +
      '第' +
      eventcahe[i]['zc'].toString() +
      '周课程' +
      '\n' +
      '教师:' +
      eventcahe[i]['teaxms'] +
      '\n' +
      '教学班级:' +
      eventcahe[i]['jxbmc'] +
      '\n' +
      '额外备注:' +
      eventcahe[i]['sknrjj'];
  //判断课程时间段，替换对应的Container
  if (eventcahe[i]['qssj'].toString().split(' ')[0].substring(0, 2) == '08') {
    dailycourse[1] = getContainer('1,2节', i, msg);
  } else if (eventcahe[i]['qssj'].toString().split(' ')[0].substring(0, 2) ==
      '09') {
    dailycourse[2] = getContainer('3,4节', i, msg);
  } else if (eventcahe[i]['jssj'].toString().split(' ')[0].substring(0, 2) ==
      '11') {
    dailycourse[2] = getContainer('3,4节', i, msg);
  } else if (eventcahe[i]['qssj'].toString().split(' ')[0].substring(0, 2) ==
      '13') {
    dailycourse[4] = getContainer('5,6节', i, msg);
  }
}