打印渲染树
1. 导入 import'package:flutter/rendering.dart';
2. debugDumpRenderTree()
统计应用启动时间
$ flutter run --trace-startup --profile
结果保存在 build/start_up_info.json
打印渲染树
1. 导入 import'package:flutter/rendering.dart';
2. debugDumpRenderTree()
统计应用启动时间
$ flutter run --trace-startup --profile
结果保存在 build/start_up_info.json