背景
学习新的语法时，经常会习惯性带上以前使用的语法风格，导致新的语法不规范，为了能够编写出更加健壮的flutter代码，谷歌在SDK2.3.0开始出了flutter代码规范检查，方便我们在开发时及时发现我们代码问题。如果你创建项目时使用的SDK是2.3.0以上默认是配置代码规范的，我现在说下2.3.0以下怎么配置代码规范。
配置1：检查你的SDK是否高于2.3.0，没有就更新高版本sdk
配置2：在项目根目录创建analysis_options.yaml文件 （文件内容如下）
# This file configures the analyzer, which statically analyzes Dart code to
# check for errors, warnings, and lints.
#
# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
# invoked from the command line by running `flutter analyze`.
# The following line activates a set of recommended lints for Flutter apps,
# packages, and plugins designed to encourage good coding practices.
include: package:flutter_lints/flutter.yaml
linter:
# The lint rules applied to this project can be customized in the
# section below to disable rules from the `package:flutter_lints/flutter.yaml`
# included above or to enable additional rules. A list of all available lints
# and their documentation is published at
# https://dart-lang.github.io/linter/lints/index.html.
#
# Instead of disabling a lint rule for the entire project in the
# section below, it can also be suppressed for a single line of code
# or a specific dart file by using the `// ignore: name_of_lint` and
# `// ignore_for_file: name_of_lint` syntax on the line or in the file
# producing the lint.
rules:
# avoid_print: false # Uncomment to disable the `avoid_print` rule
# prefer_single_quotes: true # Uncomment to enable the `prefer_single_quotes` rule
# Additional information about this file can be found at
# https://dart.dev/guides/language/analysis-options
配置3：配置依赖?是在dev_dependencies配置（注意pub get）
效果：
flutter_lints库有两个文件
删除规则
同样也可以删除默认的规则中的某些规则，或者让他不起效，只需要在analysis_option.yaml文件中的rules中，增加规则名称，并设置为false?（注意pub get）
在analysis_options文件
增加规则
只需要在analysis_option.yaml文件中的rules中，增加规则名称，并设置为true?（注意pub get）
?规格文档
https://dart-lang.github.io/linter/lints/index.html
参考
官网：https://pub.flutter-io.cn/documentation/flutter_lints/latest/
? ? ? ? ???https://dart-lang.github.io/linter/lints/index.html