我刚开始使用dart (来自python背景),而且我正在努力使函数正常工作。Error: A non-null value must be returned since the return type 'Function' doesn't allow null. - 'Function' is from 'dart:core'.此外,如果有人对一个好的飞镖
我尝试运行的任何flutter命令都显示
Checking Dart SDK version...Downloading Dart SDK from Flutter engine af51afceb8886cc11e25047523c4e0c7e1f5d408...Downloading the Dart SDK using the BITS service failed, retrying with WebRequest...At C:\src\flutter\flutter\bin\internal\update_<e
我正在学习dart语言,我在使用列表时遇到了这个问题。+= elem; return el; var sm = sum([1, 3, 4,但当我尝试使用中间变量时: var test = [1, 3, 4, 6];print(sm); 我得到一个错误: Error: The argument typefunctions.dart:5