l method
获取 value 转 bool
Implementation
List l(String key, {List defaultValue = const [], bool showLog = true}) {
if (!containsKey(key)) {
_log('当前map不存在 key:[$key]', showLog);
return defaultValue;
}
final value = this[key];
if (value is List) return value;
_log('${value.runtimeType} [$key]=$value => list:$defaultValue', showLog);
return defaultValue;
}