flutter_optimize/lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutteroptimize/one.dart';
import 'package:flutteroptimize/three.dart';
import 'package:flutteroptimize/two.dart';

void main() {
//  debugProfileBuildsEnabled = true;
  debugProfilePaintsEnabled = true;

//  debugPrintRebuildDirtyWidgets = true;
//  debugProfileBuildsEnabled：向 Timeline 事件中添加每个widget的build 信息
//  debugProfilePaintsEnabled： 向 timeline 事件中添加每个renderObject的paint 信息
//  debugPaintLayerBordersEnabled：每个layer会出现一个边框，帮助区分layer层级
  debugPaintLayerBordersEnabled = true;
//  debugPrintRebuildDirtyWidgets：打印标记为dirty的widgets
//  debugPrintLayouts：打印标记为dirty的renderObjects
//  debugPrintBeginFrameBanner/debugPrintEndFrameBanner：打印每帧开始和结束
  runApp(Three());
}