item method
取出list中的item index
需正确
Implementation
I item(int? index) {
assert(index != null && index >= 0 && index < list!.length);
return list![index!];
}
取出list中的item index
需正确
I item(int? index) {
assert(index != null && index >= 0 && index < list!.length);
return list![index!];
}